There are 74 found housing items available for you to collect throughout the Spiral. They're spread over 13 worlds, sadly currently excluding the newer worlds. Thank you, Alex Thunderstaff, for coming up with the punny descriptions!
Wizard City Found Housing Items
Brain Jar
Description: It's a jar, don't over THINK it (hehe puns)
Location: Haunted Cave – Stormdrain Tower (on the table)
Requires: one battle
Lynx Gazer
Description: What exactly could it be gazing at?!
Location: Ravenwood – School of Myth (on the right wall)
Requires: nothing
Open book
Description: It's equally exciting as a closed book.
Location: Triton Avenue – The Harvest Lord's Tower (near the door)
Requires: one battle
Pen and Ink
Description: Be careful not to spill the milk ink bottle
Location: Falmea's House – Firecat Alley (on the little table)
Requires: nothing
Tiny Arched Door
Description: It's so adorable!!
Location: Shopping District – Wizard City Pet Shop (next to the shelves on the right)
Requires: nothing
Krokotopia Found Housing Items
Sledgehammer
Description: I'm gonna fix it!
Location: Palace of Fire (near the sigil of Nebit Nirini)
Requires: nothing
Tall Ladder
Description: Great for short people, not so much for tall people..
Location: Chamber of Fire (on the lowest level, leaning against a wall)
Requires: nothing
Tall Pumpkin
Description: Simply carve a face and wear it on your head.
Location: Hall of Champions (near Rami and his hammock)
Requires: nothing
Hieroglyphic Fire Tablet
Description: It's basically a list of chores
Location: Karanahn Barracks (near the little islands, against a wall)
Requires: nothing
Bowl of Tomatoes
Description: They say tomatoe and I say tomato.
Location: Krokosphinx (next to Rehim Bashala)
Requires: nothing
Marleybone Found Housing Items
Coil of Rope
Description: A cat's best friend
Location: Wolfminster Abbey (behind a pillar)
Requires: nothing
Green Food Cart
Description: I believe they are selling oranges
Location: Digmoore Station (right at the entrance of the area)
Requires: nothing
Framed Campsite Photo
Description: They should really go back and retake this old gal
Location: Royal Museum (next to Counterweight West)
Requires: nothing
Hairdini Playbill
Description: Dogo spy
Location: Scotland Yard (on the wall facing the cells, behind Officer McRuff)
Requires: nothing
Discarded Newspaper
Description: I would have named it “wanted poster”
Location: Scotland Yard Roof (next to the stairs)
Requires: nothing
Mooshu Found Housing Items
Stone Obelisk
Description: Gather a few and you'll have a stone ton
Location: Mooshu Spiral Chamber (on the middle island)
Requires: nothing
Samoorai Bust
Description: This mighty samoorai is in shambles
Location: Hametsu Village
Requires: nothing
Round Bolder
Description: Rock on?
Location: Kishibe Village (next to Tu Luk Kwo)
Requires: nothing
Serpent Tablet
Description: Ssssssssnake
Location: Shirataki Temple – River Temple (on the wall in the final room)
Requires: nothing
Yellow Silk Kimono
Description: Available for a limited amount of time!
Location: Emperor's Throne Room, by the entrance
Requires: nothing
DragonSpyre Found Housing Items
Tiered Lava Fountain
Description: Don't mind the lava!
Location: The Basilica (Next to Zeke and Eloise)
Requires: nothing
Dragonskull Obelisk
Description: Super Shiny.
Location:The Atheneum – Dragonspyre Library (in the back of the library, up the stairs, turn right)
Requires: nothing
Dragon Wall Bust
Description: That's 1 out of 3 heads you'll want
Location:The Crucible (above a doorway)
Requires: nothing
Pillory
Description: It's a neck sore!
Location: Plaza of Conquest – Spearcaller's Tower
Requires: one battle
Celestia Found Housing Items
Coral Crab Lamp
Description: It's lit
Location: Crustacean Empire – The Barbican (inside the instance)
Requires: one battle
Chained Kraken Statue
Description: Release the kraken!
Location: Stormriven Hall – Stormriven Temple
Requires: two battles, third (boss) battle can be skipped
Water-mole Tribal Shield
Description: Mighty indeed
Location:The Floating Land (inside the stranded ship, next to Captain Fogg)
Requires: nothing
Celestian Legion Statue
Description: Saluting the mighty lords of storm
Location: The Portico (on the right side in the first area of the instance)
Requires: nothing
Open Campfire
Description: Great for bonfires!
Location: Science Center (next to Engineer Montgomery)
Requires: nothing
Spiral Crab Table
Description: Chairs not included
Location: The Grotto – Coral Castle
Requires: nothing
Zafaria Found Housing Items
Tallow Candles
Description: For keeping the boogie monsters away
Location: Baobab Crossroads – Inyanga Whitestripes' Hut (inside the little hut!)
Requires: nothing
Gorilla Hut
Description: Never forget
Location: Drum Jungle
Requires: nothing
Old Pelt Rug
Description: Made from authentic pelts
Location: Waterfront – Aisley's Tea Shop (not everyone can enter this room, not sure why not)
Requires: nothing
Purple Jewel Pile
Description: It's a little flat but not in person
Location: Waterfont – Belloq's Tent
Requires: one cheating boss battle
Elephant Queen Painting
Description: Bask in her radiance and melt at her beauty
Location: Waterfont – Black Palace (in the last room on the wall)
Requires: you have to do the whole instance
Stone Lion Statue
Description: Simba
Location: Savannah – Nemean Rock instance
Requires: one mob battle + one cheating boss battle
Avalon Found Housing Items
Forest Painting
Description: Yay more paintings ._.)
Location: Caer Lyon (on the wall on ground level)
Requires: nothing
Archery Target
Description: Robin Hood, I choose you!
Location: Abbey Road (at the shooting range)
Requires: nothing
Red Toadstool
Description: Makes a great seed vault
Location: The Wild – Toadstool Village
Requires: nothing
Avalon Royal Rug
Description: A very lovely rug
Location: Caer Lyon – Malgrin's Tower (all the way up the stairs)
Requires: nothing
Avalon Crafting Anvil
Description: Time to craft myself a Thor Hammer
Location: Dun Dara
Requires: nothing
Stone Bird Feeder
Description: Watch out for the chicken hawks! (If you're a chicken.)
Location: Outer Yard (near the Trendkill Pantera)
Requires: nothing
Azteca Found Housing Items
Tomato Basket
Description: Highly recommend skipping this item if find yourself being able to pick it up an infinite amount of times.
Location: Saltmeadow Swamp – Ship Hold
Requires: nothing
Glowing Mushroom
Description: Expose to light for 15 minutes for full glow in the dark experience
Location: Cloudburst Forest
Requires: nothing
Orange Basket
Description: It beats having to deal with tomatoes
Location: Floating Mountains – Turquoise Cave (on the table, walk around the creatures)
Requires: nothing
Fish Basket
Description: It beats having to deal with both oranges and tomatoes!
Location: Mangrove Marsh – Mozar Turtle Hunter's Tomb (in the back of the room, walk around the creatures)
Requires: nothing
Sigil Leaf
Description: It's so dull, it's cute
Location: Alto Alto
Requires: nothing
Quetzal Cage
Description: Good for trapping mistheads
Location: Three Points – Black Sun Pyramid Lower Chamber
Requires: two mob battles (You need to actually have quested up to here to enter.)
Khrysalis Found Housing Items
Mantis Vase
Description: It's a piece of grass!
Location: Sardonyx – Tower of Pale Beauty
Requires: one boss battle
Wood Pile (Ruined Market Stalls)
Description: Keep that log away from any rage potions! -the lumberjack
Location: Khonda Desert – Barrow Tent
Requires: one boss battle
Morganthe Banner
Description: Lovely, isn't she!
Location: Shadow Palace – Morganthe's Chamber
Requires: One Epic Battle 🙂
Shadow Banner
Description: It's a dark spiral, nuff said
Location: The Hive – Chamber of the Shadow Smith
Requires: one battle
Mutation Chair
Description: Do not try sitting on this!
Location: The Hive – Mutation Chamber B (walk around the mob)
Requires: nothing
Pirate Chessboard
Description: Check mate you evil devil !
Location: Crescent Beach (via Fort Rachias) – Skull Rock Cave
Requires: nothing
Grizzleheim Found Housing Items
Angle-Cut Stump
Description: Don't tell the Lorax
Location: Vigrid Roughland (near the yardbird, up the slope behind Hans)
Requires: nothing
Bear-Prowed Rowboat
Description: Sturdy and powerful
Location: Savarstaad Pass (in the water next to another boat)
Requires: nothing
Grandmother Raven Statue
Description: You traitor!
Location: Mirkholm Keep (use the red teleporter, behind the howling banshees)
Requires: nothing
Raven Brazier
Description: Really cool flames to chase the night
Location: Ravenscar (next to the Raven Fortress, use the green teleporter)
Requires: nothing
Stack of Logs
Description: I repeat, keep them away from rage spells!- the Lumberjack
Location: Hrundle Fjord (behind the Frost Goblins at the side of the house)
Requires: nothing
Net Drying Rack
Description: Smells a little fishy
Location: Austrilund (between the two tents)
Requires: nothing
Aquila Found Housing Items
Olympian Herb
Description: It's a great gift for any gal
Location: Garden of Hesperides (next to Khalkos Coppersmith)
Requires: nothing
Grand Statue of Zeus
Description: Praise the man
Location: Mount Olympus (up the stairs, giant statue)
Requires: nothing
Banner of Apollo
Description: Careful! It's a little sharp you see
Location: Mount Olympus – Sun Room (you don't have to do the battle)
Requires: nothing
Atlantea Grand Monument
Description: Man Bird vs Beast of the Sea
Location: Atlantea (right at the entrance of the instance)
Requires: nothing
Atlantean Arch
Description: Works well with housing magic
Location: Atlantea – Akheilo's Sanctum (on the left)
Requires: one mob, two bosses
Nine Fathoms Pedestal
Description: Place all the bobble heads you want
Location: Atlantea – Akheilo's Sanctum (on the left)
Requires: one mob, two bosses
Ember Stone of Tartarus
Description: Tiny flame, great power
Location: Tartarus, near the River of Spirits
Requires: access to Tartarus
Underworld Brazier
Description: Bigger flame, even greater power
Location: Tartarus, near the River of Spirits (close to the Bronze Hoplights)
Requires: access to Tartarus
Hades the Unseen Mural
Description: I cannot unsee this art
Location: Tartarus, on the wall in the last room
Requires: doing the whole dungeon
Wysteria Found Housing Items
Dragonship Painting
Description: A sturdy ship indeed, again.
Location: Wysteria Ring & Amulet Shop (up the stairs, next to the plant)
Requires: nothing
Spiral Tree
Description: Don't get too dizzy staring at it
Location: Tanglewood Way (behind the tower building)
Requires: nothing
Estate Painting
Description: Right before the plant nation attacked
Location: Tanglewood Way – Quentin Burble's House (can be entered from two directions)
Requires: nothing
Small Wooden Clock
Description: Tick-tickity-tock
Location: Pigswick Academy – School of Equilibrium (on the professor's table)