If you have not heard of Moo cards, or if you've heard of them but not yet ordered, I say hop to it! I finally ordered a set of business cards and they are great! Every image can be different -- if you have 50 photos you want to use, you can do it. I don't know of any other place that lets you print one of each design.
The paper is really thick and has a super smooth matte finish (I got the regular paper, not the green option). The process is fool-proof -- you can select your etsy photos from inside the moo set-up page. It could not be easier!
You can order 10 free cards here, but why bother? Take my word for it, they're really nice. You'll like them. Just go for the 50 pack!