At one point in our lives, we all love to color - and for some of us whose love of coloring things go beyond coloring books, artist Jon Burgerman has made this wonderful thing: the color-in wallpaper!
http://www.jonburgerman.com/Work/comments/colour_in_wallpaper/ - via RuebenMiller
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The other compound is Mercury(II) thiocyanate (Hg(SCN)2) AKA "Pharoah's Serpent" It used to be used in fireworks because of its black-snake effect. However, it isn't readily available anymore because it is toxic.