Here is a cheap (under $10) and easy kid’s storage solution: an over-the-door shoe organizer. We have two. One on each side of the kid’s bedroom door.
One side of the door is for art supplies. Towards the bottom (easy to reach) are crayons, markers, pencils, etc. The top pockets contain lessor used items or ones requiring assistance using (i.e. glue gun).
Behind the door are miscellaneous objects and toys the kids collect (everything from McDonald’s toys to marbles to Pokemon cards to rock collections). It’s not necessarily pretty. I’m more concerned that everything has a place to go, which is not the floor!