Ok, Just had an idea for the space station, that need some good textures for it.
I am gonna make a holographic display of the planet, with the moon and moonbase orbiting it.
So, I can make stuff so you can pass through it, and make things oribt on a set path at a set speed. I can also make certain textures have effects.
Example:
The gun and bar signs on most every map.
It looks like a floating neon sign, the texture looks like this:
But the effect when using it on a func_wall with additive is this:
Pretty much, when using things as an additive, it will remove anything with black, and keep the origonal light levels on it, making it look like neon.
So think about that as making some good textures for holograms.