Carefully cut around the subject.
A shadow box works great for this project. This particular one is a really inexpensive version from IKEA.
I decorated the back insert with a whimsical scene and created another strip for the third photo.
Place the photo against the glass and glue the sides of the paper strip to the frame.
Attach the back insert and you're set!! It's such a fun way to really capture action and movement...and your kids will think it's pretty cool!