I made a second design using the suggestions to have the word "coin" in grey, and to include Charity and Ecommerce in the design so people would know what the coin was about. This design is on a mug, but it's available on a bumper sticker (and many other products) as well. The bumper sticker is a little bit different because it needs to fit into a longer rectangle, rather than more of a squarish one.
The new bumper stickers and the products that I made so far are available at the
Noblecoin section of my Bitcoin POD store.
If you have any requests, feel free to send me a PM. There are a lot of newer items that I haven't made yet, but if you would like it designed (like on a wallet), I can make it. I actually need a new wallet, and I haven't bought one yet, because I have a cute idea for a wallet and I haven't gotten around to designing it yet...
I have to thank you all for inspiring me. I had gotten out of the designing habit when I had to go get a part-time job last summer to help out the family, and hadn't really gotten back into it. Creating these designs has inspired me to make more (both crypto and non-crypto related).