I'm modifying the skin files, ex. c_gdi_hotwire.dds, or c_nod_shipcaptian.dds. idk I used to be able to create skins and stuff before I got a new computer but for some reason the programs I used don't seem to work right anymore :/
I don't have photoshop (costs $) and paint.net loaded gimp which coverts everything but .dds