Sorry, another poll I can't participate in.
Your work is really GREAT!!! If I could get a few of them I'd keep one original as "baseline", paint one flat black, one flat green, and then I'd do my best to create one as cool as the ones you created.
Come to think of it, maybe it would be worth it to buy a case of the Israeli grenades and give it a try. I've never painted rubber or plastic but they must make primers that will allow it...... thinking............