This would be an easy way keep your living space feeling fresh: get wallpaper that changes. Of course, you'll also have to flood your room with red, green or blue light to make it happen.
The optical illusion is the work of Italian design studio Carnovsky. Under normal conditions the pattern on the wallpaper looks insane as you're looking at all of the different iterations at once (so it looks like a 3D image when you're not wearing 3D glasses, basically).
Toss in some light, though, and that's when things get exciting. With red, green or blue light only certain designs on the wall would be visible. You wouldn't have to stick to iterations of a skeleton as Carnovsky has done here, and, as you can see above, the more light on the wall the better the effect.