I put a Blik Carnovsky decal (http://www.whatisblik.com/shop/rosone-n-3-insecta
) on the ceiling of my office with an Ikea Hyby fixture. The decal superimposes three patterns in RGB, and comes with three colored glasses. The glasses concept is fundamentally flawed, since any filter shows two of the three patterns dark against the white ceiling (and the same thing would happen with colored light). It's cool though.