For the lighting, have you tried changing 2fort's lighting so the ambiance is more purple? I think that'd give neat results.
Well I'd like to--the issue is in colors...
My fancy art school edumaction tells me that there's a fundamental problem in going from a yellow lighting source like 2fort to a purple one. They're complimentary colors. What this means is when you have saturated yellow color, and you want to desaturate it, you add some of the compliment, so violet. What this does is bring the saturation down so the yellow is less vibrant. The more you add, the closer you come to a neutral gray color--and that doesn't work. You want your light color to have a good saturation to it, but not too much. Having no saturation is almost worse.
So I guess it really makes a difference when you go from a purple light source to a yellow one. It's nearly ironic that I picked complimentary colors, though--this is a good idea. When you have a big contrast between sky color and ground color, you usually end up with fantastic visual results. A good practical application is to look at almost any tf2 desert themed map with a blue sky--what's the compliment of blue? Orange. There's a ton of orange/red/yellow warm colors that contrast with the blue desert sky. I'm thinking that if I crank up both yellow saturation in the light color, and make the sky violet more vibrant, I could have some interesting results.