Raven (greyorm) was good enough to donate a completely kick-ass design to the Forge for us to use in the store. I've updated it with all sorts of t-shirts, bags, and the like with his graphic. It's really worth a look, and you can help support the Forge by getting yourself some cool con gear.
http://www.cafepress.com/cp/store/store.aspx?storeid=indierpgs