Here's a cute idea found in the Pray & Play Bible 2 for praying with your young kids.
"Invite children to remove their shoes and socks. As you and your children touch each one of your toes, take turns naming one thing that God has made. If you run out of toes to count, touch your fingers as you name even more things God has created. Then pray, thanking God for all he has created, including the toes on your feet!"
Do you have any other ideas for keeping prayers fresh and fun for little ones?