Hahah...my boss wears solid colored cotton shirts in such great colors....I have told him that if he ever is going to get rid of any, I'll take 'em!
I have yet to buy shirts to make into quilts (although I KNOW I will at some point) - there is a Goodwill outlet near my house where they sell clothes by the pound and I eye those bins sometimes and ponder the possibilities. Usually I am looking just for interesting "stuff" though - I got a decent 15x17 light table there, in perfect condition, for $4! I love thrift stores!