The Message in a Cookie cutter may be one of the best things I ever purchased. It's fitting that the first time I used it was for Sara's bridal shower as she is the one who told me about them.
The set comes with 3 cookie cutter shapes - rectangle, star, and heart. Each cutter has a track you can put letters on to personalize your message. The kit comes with a few words (Happy, Birthday, Congratulations, etc) and a lot of individual letters. You just pick out your message; slide it into the tracks, and walla! Awesome cookie!
I just saw that they have this for Christmas cookies as well. I NEED TO BUY THEM IMMEDIATELY.