The very first thing I did for this wedding was the stamp. I drew a picture of the barn we'd be dancing in and sent it off to be made into a stamp. If you're in the NYC area, I cannot recommend Casey Rubber Stamps in the Lower East Side enough. John Casey has made a few stamps for me now, and they are always perfect, he his stamps are made with real red rubber, as opposed to the plastic stuff more commonly used these days.
I used the stamp to make the rsvp cards, and also stamped anything that could be stamped at the wedding.
For the rest of the invite, as well as the programs for the ceremony, I designed them in photoshop and then screen-printed them by hand using my beloved Print Gocco. The Japanese company that made this little screen printing kit shuttered it's doors in 2009, and today the supplies are dwindling and the prices sky high. Luckily, as a bit of an art supplies hoarder, I had a small pile of screens and bulbs with which to make my prints.
The paper I used is my absolute favorite paper of all time to use for all things - Fabriano Medioevalis single cards and envelopes. They have rough-hewn edges, a perfect thickness, and a beautiful texture. And the 4-1/2" × 6-3/4" cards fit perfectly in the print gocco!
It was definitely a laborious process to hand print each piece of paper, but I couldn't be happier with how they came out, and each piece is slightly different from the next.