This year I took the liberty of ordering some Onepocket.org pin back buttons for those going to the derby. I made them 1" bright green with Onepocket.org printed on them. Find me when you get there and I'll give you one. I figured members can pin them on a hat,shirt, pool case, etc. My thought being it would be easy to identify other members from a distance and could lead to more interaction. If you wanted you could print your screen name on them with a sharpie.