Lisa Congdon is a crazy good artist....you may know her from her Collection a Day series? If you dont, you really should! This year she's taking that collection a bit further by doing a daily hand lettering exercise...each day it's something a little different, and really made me think that it could be a great thing to work into your wedding!
I'm not saying you need to calligraph every one of your wedding invitation envelopes or anything, but with a little practice, you could potentially hand letter your invitations! Just send it off to get letterpressed and voila, instant, awesome invitations!