Yeah, I know..... my mom's has been in the art field for many many years and therefore I have been color theory brainwashed..... point being that yes, you can mix two colors whether it be a light through translucent plastic or whatever to create different effects. (trial and error)
Blue being a primary color can't be re-created by mixing two other colors.
But say you have a yellow reject button and a strong enough
blue LED, you may get a somewhat blue effect. (IF it's a
strong blue)
Red + White for pinks......
But once again, none of these effects will show when light is off obviously.
All of my stuff tends to come out somewhere in the Burnt Sienna range.