If you're having your invitations engraved, you can use the plate that's created to print the invitations for lots of things. The example I've heard of the most is having a silver tray engraved with your invitation design...its gorgeous. But if you opt for a less expensive mode of printing and still want to preserve your invitations, Kaas Glassworks has the answer! They decoupage under glass, so your invitation can be made into trays, plates, coasters and/or paperweights. Obviously a tray would be the best way to still see the entire invite (the pictures on this post are example of trays from their site). Prices start at $62 and go up to around $175. I suppose I have to actually finish designing our invites and have them printed before I can consider this, but a girl can dream!