I managed to get the thank you cards made and ordered. I was waiting on a few shots from my photographer, who's totally swamped with work right now - so I'm just happy to have them done and to have such a great photographer to go along with my insane requests.
The wording on the card reads:
"A loving note can barely express how you have added to our happiness.
We would like to send our sincerest thanks for your thoughts, your prayers, your wonderful gifts and your presence in our lives.