1st idea: I want Gravity/physics gun. that'd be awesome:D so you can like spawn monsters and/or animals, then use physics and/or gravity gun to move and shoot(gravity gun-lazer)
2nd idea: How many of you have seen MegaMind? the Blue guy with the big head? if not, he has this de-hydration ray which turns mobs and hostile mobs into objects, then if they touch water, they turn back into mobs.