Have you heard of Minted? It's a pretty good website to get completely sucked up into, only to come out an hour later dreaming about baby shower invitations and moving announcements - even though you're in no way planning on having a baby OR moving.
The nice thing is that they sort of have a Threadless-style system going, with themed challenges for artists and designers to submit too... with promises of prize money and a cut of the profits if you're picked! Obviously there are more direct ways to make money as an artist, but I sort of like the homework-esque feel to these challenges. After all, the pressure of a deadline always works well for me.
So here's my little plea, oh Dear Lovely Readers of My Blog. Would you go vote for my submission to their latest art print challenge? I'm quite happy with what I came up with, and hopefully you are too!
And even if you don't vote for it, at least go look around. There's a lot of fun stuff to find, and a lot of talented people contributing!