The wallpaper plugin idea I had is like disguising a block to look like something else, only it carries the same properties as before, just appears different. For example, I make a trap with a dispenser and when the person steps on the pressure plate it shoots arrows at him, but he might notice its a dispenser, then not step on it. Although with the plugin, you could make it appear to be a cobblestone block, instead of a dispenser, so it appears that a cobble stone block just shot you with an arrow. Another example is your hiding a chest and making it appear to look like grass, or dirt. So you can easily fool people with this plugin. Although I found nothing like this anywhere. Can someone please develop a plugin like this? I could really use this, and so could a good bit of my friends.
Thanks! Now I got chests covered, but any chance that theirs a plugin that does that to any block as well? I need to hide some dispensers, and maybe even add little easter egg blocks, like make a block of diamond appear to be stone, so when they mine it they get diamond.
For mining stone and getting diamond instead you could just use a drop editing plugin. There are quite a few here. But that changes it globally and not for the one block
texture pack? If you had spout you can force diamond, dispensers, ect... to look however you want them or use another block (say sponge) give it the sam texture as the block you want (say diamond) and like EdTheLoon said use a drop modifier like otherblocks.