When you print your invitation you should consider a nice quality of paper, if it's scented or not. After that, roll the paper, add a ribbon and some design.
How about cards shaped in the picture of you house and a picture of where you live. Or just simply mail personal cards to each person. This may take time but it saves money and will give each a special touch.
You should send them some cookies. Yes, some cookies with a little letter inside them on which you're inviting them to your wedding. It's a good idea and an original one too.