I wanted to remember my children's footprints for their first year and debated how to do it. Someone gave me as a gift the Pottery Barn 1st Year photo frame and with that came an ink pad and some paper. Taking that concept, I started putting on the footprints.
My husband took a photo of my daughter's feet in my hands and the project took off from there. The middle image is the footprint of my daughter at 1-week. then from there I knew I could get 4 more sets of footprints onto the paper so we did 3-months, 6-months, 9-months, and 12-months.
Using a 10" x 20" frame, and they fit perfectly together. Michael's craft store sells ink pads that are child friendly, and baby wipes are easy to take off the ink once it's done.