I am using one our our guest book table. I have a sign that reads "While you're here, be a dear and sign our book" a picture of us, and our logo. I got 3 matching frames and the really small one is the one I used for the logo (maybe 2x3).
I have it on the front of our programs. I printed it on vellum and then mounted the vellum on pearlized pink paper.
I printed it on the back of the envelopes for invites. I am also using it on the phone list/itenary (no CLUE how to spell that) for our family and wedding party.
I don't think I have over done it. Just a few splashes.