colors?

If you have already painted them dark yellow, you could add either green (it's either light or dark, can't recall at the moment) or red brown in either a striped or splotched pattern. You could either do green or red brown by themselves on top of the dark yellow, or use both of them in a 3 tone paint scheme. If you are unsure of how to paint them, look at the gallery section in a few websites to help you get a feel on how to paint the vehicles. Two good places to start are:
www.track-link.net
www.missing-lynx.com

thanks for the pointer, I really appreciate it!!!!!!!!!!!!!!