An idea I had that's very much similar to the character customization. Give people a literally blank white block in the build menu, no designs or anything, just blank white. And give them the ability to upload their own design, or use one that someone else has uploaded, in place of the white block. I thought this would be a good idea for making things like TVs, treasure chests on pirate ships, etc.
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Mod Edit: Original post here: http://minecraftforum.net/viewtopic.php?id=915
Former #minecraft channel operator.