Wow cranberry, you really summed things up nicely in that post. I think I will just copy and paste it next time somebody asks about the WC's. (If you don't mind.)
Here is a list of all of the prizes I have heard about. (It includes those mentioned on PPT as well as NeoItems, the NeoBoards and Neomails people have written me.)
Darigan Paint Brush
Pirate Paint Brush
Maraquan Paint Brush
Faerie Paint Brush
Mystery Island Paint Brush
Lost Desert Paint Brush
Pink Paint Brush
Ghost Paint Brush
Fire Paint Brush
Spotted Paint Brush
Cloud Paint Brush
Starry Paint Brush
Disco Paint Brush
Rainbow Paint Brush
Electric Paint Brush
Glowing Paint Brush
Orange Paint Brush
Silver Paint Brush
Split Paint Brush
Gold Paint Brush
White Paint Brush
Shadow Paint Brush
Scritchy Sketchy Paint Brush
Invisible Paint Brush
Christmas Paint Brush
Brown Paint Brush
Yellow Paint Brush
Plushie Petpet Paint Brush
Pink Petpet Paint Brush
Grey Petpet Paint Brush
Black Petpet Paint Brush
Robot Petpet Paint Brush
Tyrannian Petpet Paint Brush
Halloween Petpet Paint Brush
Ghost Petpet Paint Brush
Purple Petpet Paint Brush
Brown Petpet Paint Brush
Green Petpet Paint Brush
Spotted Petpet Paint Brush
Glowing Petpet Paint Brush
Faerie Petpet Paint Brush
Christmas Petpet Paint Brush
500 Dubloon Coin
10 Dubloon Coin
Cool Negg
Kauvaras Potion
Eo Codestone
Bri Codestone
Zei codestone
Har Codestone
Snowickle
Meepit
Gallion
Khonsu
Mortog
Feloreena
Acko
Mirgle
Screal
Whinny
Reptillior
Apis
Trumadon
Dragoyle
GX-4 Oscillabot
Pawkeet
Symol
Primella
Take note of the very crappy codestone prizes on the list. A LOT of people have been reporting getting those and I think it's outragous and rather cruel for TNT to have set those as prizes. The World Challenge pictures aren't like the Treasure Map pieces that you get through random events and don't have to work for. You have to do a lot of work and spend alot of time to earn the WC pieces so I really think everybody deserves something more expensive than a codestone.