I've posted this here before, but I haven't seen many other people who have gone the same route.
I really liked the results I received from
CafePress.
You create your own "webstore" for free, upload your custom artwork, and then choose a product (such as a poster) to apply the artwork to. Then you just buy the product from yourself at cost. You can raise the price if you want to sell it to others and make money off of them.
Everything is in US dollars, but I did the conversion to Australian dollars, and for a large poster which is big enough to print a large control panel overlay, it only costs $17.99 USD, which is about $26 AUD. And for International shipping and handling it is $7 USD which is about $10 AUD. Not too shabby.