i usually get a couple stickers/decals from OldMiniBikes warehouse on orders , but always like when folks have talent to create something new on computers - heck i still have a hard time just turning the damn thing on sometimes. i like gumpits idea of trading cards of minibikes maybe Topps might be interested.
http://www.oldminibikes.com/forum/minibike-maniac-t-shirts-decals/90339-custom-mini-bike-maniac-decals.html