For whatever reason I could not find a completely finished invite in my stash of wedding stuff so the one above just needed the black cardstock glued down, and yes that is Grant's hand on the left ready to grab my invite and run.
The invite had 3 layers, the first was the top that you see above with one of our monograms and a quote I found online. The second layer was the actual invitation and the third had the response card attatched.
Here is our response card, it is in postcard form. The opposite side had my address and a stamp.
I printed the response cards in Publisher as well using the same font and making it into a postcard so there would be no need for envelopes (one less thing to purchase). I attached them to the back layer of the invite with clear photo corners. The only thing I would suggest is not to even bother with response cards. I probably only got a handful back and spent quite a bit on stamps and it seemed pointless in the end when no one really used them.