Resendable Greetings and protophoto are sister sites. Resendable Greetings focuses on amateur art. Protophoto focusses on photography. Well, snapping a photo is a lot easier than drawing a picture; So I will finish the protophoto site first. You can turn any photo in Protophoto into a greeting card. Simply browse through the photos; if your like it, then press the "eCard" link.
I present in this directory, a collection of photos that might make good cards.