I stamped on printed paper, cut each piece out and pieced together to create the front of our postcard invitation. My sister was having boy/girl twins, so I chose pink and blue printed papers for the pigs and added stickles glitter glue to the wings for some sparkle.
Tip: Once I had everything laid out we sent the invitation to an online printer to mass produce. You certainly can print from home, but I really like Vistaprint.com as they gave me a great price for 100 invitations, included the envelopes, and matching address labels.