Of course, just extract the color you want to eliminate say yellow, grab all files associated such as the menu icon, core, blade glow and wall glow textures, change them to the color you want but do not change ANY names of files. Zip/pack everything up into a NEW pk3 with the same folder structre that the assets have for the saber blades and place your files in the folders and you should have replaced yellow for instance with silver. Since Raven doesn't exist and Lucas Arts wont care why not reupload SP RGB sabers mod? It's no longer considered illegal like it was before.