What do I do with old helmets (motorcycle and bike)?

Cute little container gardens for flowers or some other non-edible after drilling the bottom out w/ the largest drill bit you have (maybe the one in a door-hanging kit).

Donate them to fire/EMT department.
They will use them to practice removing helmets from accident victims.

Ooh, really? This is the best idea I’ve heard yet. At least that way I’ll know they’ll be used to help somebody.

Seconding the great idea! I’ll check w/ our military base’s FD and see if they could use some as well.