For a change of pace try using your off hand instead of your primary hand. You might want to experiment with a variety of other grips using this combination. I'll be honest and say that I can rarely if ever actually come using my off hand—it either just doesn't feel right or I can't get the right rhythm. I see this more as a source of variety in the middle of a masturbation session or just to give my primary hand a break. But don't let this stop you from trying the technique and maybe finding something that works for you. Who knows, maybe you'll discover you're ambidextrous. Or should I say "ambisextrous"?