I made some heads for my army. I couldn't stand looking at them all looking the same.
basically, you cut off the face keeping the light piping and the shape of the wreck-gar head. make sure to chop off wreck gars red eyes and be careful not to break the antenaes. (although broken antennaes can also be cool to make em' look different from each other. take some of your spare heads from other bots or broken ones then chop it off in half then glue. if you want you can even keep the original colours if you like.
i don't have names for mine yet though but whatever they are just the random ones anyway. the more random the better the junkion looks. plus you get to keep the light piping. you can also reuse the handle bars that have broken off to make them look different from each other. i might paint these as i go.