I have a pile of drywall scrap that's been sitting in my garage for a few years after a remodel, "just in case". My buddy came up with the idea of turning it into "karate boards" for our kids to destroy. Scrap pieces start at half sheet (4x4) and go down.
I'm also on the lookout for an excuse to buy something new. (Honey, it's for the kids!) At this point my only idea is to use the circular saw and toss the blade afterwards.