I've got my RM dice, too. Ten siders. Clear. One purple and one green. Purple is usually tens. That set seems to know if you need high or low rolls and produces accordingly. I have used them for other games, and they work well, there, too.
One habit I picked up some years back was using a d6 and a d10 instead of a d20 for D&D. That was common practice with one group I played with, and it just stuck. 1-3 is zero, 4-6 is add 10 to the roll of the d10.