well yes. Can make clean textures, but here is few facts because you dont want to use clean textures:
1. Clean texturs must be high res and (if want them good) need good shaders and maps (N,S,I) so its takes many fps on high lvs and that is not good side of FPSC: PERFORMANCE.
So we must use grunge to hide weaknes of FPSC. Grunge can be even 256x256 and still look good.
2. You cant make horror games with clean textures. Everybody use zombies and horror because lower quality and dont need to have good AI.
3. Grunge still looks better.
My Specs : CPU: Intel Pentium Dual-core 2.80 GHz Win7 Ultimate
Memory: 4 GB RAM DDR2
Grapphics Card : NVidia GeForce 210 1 GB