I'm working on a costume that will require some accent lighting. I plan to accomplish this with a few small circuits to power white LEDs behind some diffused acrylic cutouts, so that the cutouts will glow. The problem I'm encountering is that the accent lights are blue- I was initially thinking I could get away with using clear/white/uncolored diffused acrylic and using blue LEDs behind it so that the light is blue, but then realized that the pieces will look white if the lights aren't turned on, or if I'm in bright lighting. So I have to use white LEDs with blue acrylic.
I'm not seeing many options in the color that I want (I need maybe a 1/16 thick sheet in a saturated cyan-blue color- think cyborg!) but the few options for that color that I see are either too thick or too much (it should be about 1/16 thick, and I don't need more than about a square foot at most). I'm thinking my best option is to get clear/white diffused acrylic and then paint behind it with some kind of clear paint or varnish so that the light can still shine through, but the whole thing will be colored. I'm thinking something like what stained glass kits use. What kind of paint should I use?