Step 1: In the browser, go to Textures - CloneTextures - CloneTrooperTextures, and export "CloneTrooper"
Step 2: Save as CloneTrooper.bmp (It HAS to be .bmp, unrealed cant save/import anyting else for some reason)
Step 3: Open it up in the image editing software of your choice (Photoshop, gimp, etc), and edit the following places colors. I personally suggest using colorize.
Step 4: After you have finished, go back into UnrealEd and import your texture.
Step 5: Fill in the Name slot with the desired texture name.