This is a fun activity to make with or for your children. I was thumbing through some craft books (specifically Step-by-Step Crafts for Children published by Kingfisher) and saw this idea. I simplified it a little, but the sky is the limit.
First I found some free clipart pictures of animals. I selected ones of similar sizes.
Next I cut each one to the same size. (I chose 5" squares.)
I glued each picture to colorful cardstock that was a little larger than the pictures. Then I cut the pictures in half as shown here.
.I stapled the pictures inside the cover and then used a type of duct tape to cover the staples.
This would be very fun to do with family photographs or with pictures the children color.