You'll need dxtbmp, or imagetool to convert the textures to, and from FS formats / editable format.
(FS reads 256 colour, dxt3 (compressed) and 32bit (uncompressed) formats, you can edit a 24Bit bmp)
Dxtbmp is here:
http://www.mnwright.btinternet.co.uk/pr ... dxtbmp.htmYou will also need an editing program. The most basic is MS Paint, there are others such as Ppixia, Gimp i think, and Paint.net etc... You can also used payware packages such as paint shop pro, or photoshop.
Personally I use imagetool for conversion, dxtbmp to add "alpha" which is for reflective textures, and Paint Shop Pro for editing.
Hope that helps.