Im skilled with photoshop at wall textures, cement, rust, corrosion, dirt, rocks, bark, etc... Last PS version I used though was PS CS1, so I am going to refresh myself with some quick tutorials going over the new features in CS3 (or is there a CS4) too many version. Give me an email if you need anything.
-EDIT-
Just a note, never made any maps/textures for 3d models, realized that just a one sided, flat texture would be pointless on a 3d object O_o. Ill have to do a little research into that before I offer help via that part of designing. I can do non 3-d photoshopping for now. In-game menus, HUD's, selection screens, icons, etc...
Send me an trial via email.
-Bostwick