Not so long ago I ordered and received a few postcards from my tulip and sunset photos. Professionally made in SmugMug photolab, they looks really nice and come with white envelope. Those cards for sale on Etsy right now:
http://www.etsy.com/view_listing.php?listing_id=24410595.
Actually, any of my photo can be made as a postcard and I can make on photoshop any customized greeting.
