Thing Stickers are acquired first as "Things" (realistic objects in the paper world) and converted to Thing Stickers at the Sling a Thing attraction in Decalburg or Outlook Point. Here is a list of all Thing Stickers in Paper Mario: Sticker Star:
Cutting Type
Sewing Scissors
Hair Shears
Scissors
Tailor Shears
Wind Type
Bellows
Paper Fan
Fan
Suction Type
Mini Vacuum
Upright Vacuum
Vacuum
Flood Type
Watering Can
Faucet
Teapot
Noise Type
Trumpet
Violin
Guitar
Bat Type
Newspaper
Toy Bat
Bat
Crushes Type
Square Can
Basin
Drum
Light Type
Lightbulb
Flashlight
Searchlight
Shocking Type
Watch Battery
D-Cell Battery
Car Battery
Thrown Type
Billiard Ball
Curling Stone
Bowling Ball
Trophy
Earthquake Type
Cell Phone
Jackhammer
Heat Type
Radiator
Hair Dryer
Oven
Fire Type
Magnifying Glass
Matches
Lighter
Cold/Ice Type
Shaved Ice
Air Conditioner
Refridgerator
Spray Type
Soda
Squirt Gun
Defense Type
Powder Puff
Sponge
Car Sponge
Sleep Type
Pillow
Bed
Luxurious Bed
Immobilize Type
Tape
Thumbtack
Stapler
Miscellaneous Type
Rubber Ducky
Fishhook
Balloon
Pocket Watch
Cat-o-Luck
High Heel
Goat
Turkey
Cake
Boom Box