I just finished my boarding pass invites and surprisingly I found these to be a lot easier than the passport STD's I made. I'm pretty happy with the way they have turned out. I perforated the RSVP portion using a sewing machine, so my guests can tear it off and stick it in a ready made envelope.
Supplies: metallic cardstock and envelopes from http://paperandmore.com/
double sided tape1/8 inch eyelets and setting tools
fiskars paper cutter
sand dollar punch
personalized address stamp form etsy