Hippies man it was kind of a big thing down here, guess you only got the draft dodgers up there.
But seriously, they're cheap, fun, and easy to make. You can get pretty artistic with them too. I've made some pretty dope colored shirts before.
Find unconventional ways to pinch your shirt when you make em, everybody uses rubber bands, you can do some cool shit with clothes pins and office clips and things like that. Don't just bunch it up and spray color in there that just looks messy. I horizon. folded the bottom of a shirt once and then bunched the top into a cone with blue and red on the bottom and orange for the cone on top. When it unfolded it was like a sunset at the beach or when the clouds go blue and red at the end of the day.
If you try you can really make a picture rather than a pile of puke on a shirt.