If you have a mean landlord who doesn't let you paint anything in your house or apartment, this could be a solution to your lack-of-color woes. The Morpheus Ambient Lighting Modules use really, really, really, really high-end LEDs to mix a combination of red, green, and blue light. Then it projects it on white walls--sorry, I'm not sure how it would be distorted by that lovely eggshell or alabaster color you've got in your living room.
It'll cost you the Brit equivalent of $167.
Basically, it's the ultimate haute end of color-changey gadgets. Because here's the best part: not only can you select from literally millions of potential color combinations (way more choices than the selection of Benjamin Moore paint swatches at your local Ace Hardware), you can program the uber-sleek Morpheus to cycle through colors as well.
Actually, that's not the best part. The best part is that these LEDs will last you 40 years before you have to change a bulb.