>We used duck fabric or >anything heavy, put grommets in them just like a shoe and had a shoestring >attached at the frame. The children loved them! They would lace up, tie and >untie all day!
We had a cooperative kindergarten going when my kids were little. I took
shoe boxes and painted a big old shoe on each one, very whimsical, colorful
etc. Put brand new shoelaces in the tops of the box, and yes, they were
pretty fascinating for the kids.