Have you thought about using them but not sure how? You just might want to CHECK THIS OUT !
I haven't put as much effort into them before, but I've made similar.
Right now, we have a "body-box". It has three or four full picture or interactive body books, a body puzzle, and a skeleton on the front that we have small cards on the inside that we "label" the bones with their correct names. We keep adding more names for the bones specifically so it's a little easier for my kindy. I am adding to the box as we move along in Anatomy this year. It's not very big, so if it gets too full, I'll have to take some things out that have been thoroughly used.
I have a whole bag full of busy bags from a swap. I never use them - but I have a 2.5 year old & an infant, I don't know, maybe they will come in handy when they are 5 & 3?
It seems to me that the nicer ones would be useful. The ones I got from the swap are meh.