You should offer merchandise with BTC symbol for sale using BTC currency as payment. Actually, since it's open source, technically anyone could make, design and sell related merchandise and offer to sell it for Bitcoins.
I got high on my own supply first.
If anyone wants bitwear the majority of profits go to donations on the forums.You can also use the design as a template for any products you want at zazzle.I would prefer you purchased gift certificates as then I only need an email address to send the code to.The price in bitcoins is the latest exchange price at bitcoin market.
View them at bitcointohttp://www.bitcointo.com/2010/07/bitwear-zazzle-bitcoin-products.html