I have been researching stock art subscription services like Shutterstock.com and iStockPhoto.com. They mention that you can't use their artwork for print on demand:
"Print on demand projects such as postcards, mugs, t-shirts, posters, giclee prints, wallpaper, artwork and other items."
I understand that you can't just take any photo on there to slap on a postcard and just resell it, but what if you use multiple photos or just parts of it to make business cards? I guess I am asking if you actually design items to sell is that different than what they are talking about.