Heat sensitive wallpaper
Here's a cool and/or interesting idea. Heat sensitive wallpaper. No idea if it's real or not, although I'm guessing the concept would be possible, HyperColor T-Shirts anyone?
The potential applications for this sort of thing are limitless... well maybe not limitless, but definitely interesting.

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Well, there’s heat sensitive paint, so even if this stuff doesn’t exist, you could paint something of your own on your walls! all over the walls! imagine the fun!
whoa.. thats a very cool idea!
Don’t let my wife see this. She’ll have me wallpapering the whole house!
hahaha – cool!
My wife saw it and thinks its a good idea!
Thats cool, god i remember those t-shirts, awful!