Sort:  

I like the creativity in this idea, layering translucent colors I understand, not sure yet how to do the various colored lights at a public place, will do some tests at my place though (I got this LED light which puts out any color you want) and will post the results here, thanks for your idea!

I am not entirely sure how it would work myself :c) At its simplest level a blue image my become invisible in blue light. The same would be true of red in a red light.

So two images overlaid over each other - with a degree of translucency sufficient to let the other layer show through - might bring interesting results.

Its just an idea & I am not an artist. You're welcome. ^_^