If it's yours too, here's how I made mine.
Rolling Pin (mine is a metal tube from a home improvement store)
Air dry clay (you can actually make this if you want)
Lay the air dry clay between the wax paper and roll it out. As you can see on my rolling pin, before I used the wax paper, it got all over the rolling pin and wasn't pretty at all.
Squirt out your paint and dab your sponge into it. Make sure it doesn't have a lot of paint on the sponge because too much paint means you won't see the little lines in the foot.
Cut out the cute little feet and add holes.
Put them somewhere safe so they can dry. I'm also going to sand the edges to make them a little nicer looking. Since the red feet look like bloody foot prints, I'm going to outline them in green and tie a green ribbon on the top.
Oh, and don't forget to add the date to them with the baby's name so you're not sitting around once they're grown wondering which kid belongs to the footprint.