I've been working on Tranquil Nuclear Winter, which is a complete overhaul of the world textures so that all the Mech3 worlds on Tranquil look like an ice world! It's coming out pretty good, using existing textures and windows paint, not being a texture specialist, I think I'm doing ok. Yes, if someone could spend all day working on it because it was their JOB and they got PAID to do it, it would surely come out nicer. But, for someone who has a life and can only spend a little time here and there with limited tools I think you will be pleased with the result. I will be posting new screenshots of each world as I go, on the "Tranquil Nuclear Winter" page, check it out if you haven't already.
Bring the Paine!