One way would be to go to ATCsForAll.com and see if you can find artists there.
I'm tying to get artists here into sending mail and exchanging art but it's too much of a jump if I started changing mediums all of a sudden. I'll keep it in mind though.
I would think you would have to decide if your creations are worth what others are creating and if they're okay with it then you could trade.
You can set up s personal trade journal here to find artists. I just posted one so you coukd look at that for example.
Also I know of Adobe Facebook groups that are open to more than just art cards when they do swaps and trades.