Many on here have mentioned getting the lime green mouse ears on paint samples at Lowes, to attach to bags. I'm a newbie too, but it sounds like fun to me!
Home Depot sells Disney paint and has paint samples in the shape of Mickey's head. There are 2 colors that are lime-greenish. Green curling ribbon also works well.
I got the paint samples, put each persons name on one with a Sharpie and then covered it with contact paper. Wal-Mart has pins with adhesive that I put on the back...TA DA! Our very own, unique name tags! We really enjoyed the extra attention we got because of then Too!