From the lovely folks at PhotoJoJo.com
It's fantastic and poppy, but since one must go on a personal photo safari to find all the needed numbers (1-31) and letters (M-Sun), it could be carefully designed to fit your personal style. You'll need a camera, photo clips (available at the website), and optionally, a photo printer with matte paper, plus scissors to cut your photos into hip little squares. Photo adventure/mission, typography, pop-art, functionality, great interior style, and a conversation piece -- what's not to love?
Also adore this idea:
Photo Jojo is my new favorite crafty site!