I saw PJ's fun new return address stamps at the National Stationery Show last May and couldn't stop playing with them. You can pick your ink color, they are self-inking and not messy, and come in a bunch of styles and ink colors. Plus they're only $40. And they have a cute pink handle. Hello, ADORABLE! This would be a great way to dress up save the date envelopes or you could even use them on the front of response envelopes. You can check them out here.