why not! its your wedding!
but there is a company Blue Moon that we ordered our invitations from. they are on the expensive side but I am sure you can mimic it. It is shaped into boarding passes but a bookstyle of 3-5 pages including invite, itinerary, story of us, and rsvp. its actually cuter than a passport. you can do the passport for a program? I have seen beautiful passports as well but I think boarding passes were a hit with my friends. We used baggage tags fro our STD.