I like your textures. I'll experiment with them at some point, they have a cool retro scifi feel to them. What I think TF2 needs are scifi textures. I'm sure a lot of these could be made that are simple but effective; unfortunately I'm not a graphic artist.
Really to make a scifi map at the moment would require either extreme lighting or HL2 textures. Extreme lighting sucks because you can't tell which sides people are visually, and the community as a whole seems resistant to HL2 textures at the moment. Personally I think that entirely HL2 textured TF2 maps should be kosher, and will eventually catch on because of the limited texture set we currently have. After all, TFC used realistic textures.