Green stuff painted right might do the trick...in fact, now that I think about it, you might get glue to do that if under the right circumstance. Best of luck. Oh, and for my models, (especially important ones) I like to decorate with skulls and broken pieces of equipment. If the base allows, sometimes I'll manage an entire model from an army I hate (High Elves!) and have him being ripped in half or something to that effect...