"I would like to make some bags up for wiggly toddlers..."
Yes, I admit to a rather warped sense of humor. I can picture the church cloak room, a row of pegs, and a line of open tote bags filled with wiggly toddlers. Their mischievous faces peeking out!
Here's a link with some that I think you really had in mind!
http://teachingmama.org/busy-bags-101/