Enter the wire rack paper organizer. This is not my original idea. I saw it on a blog years ago and sadly have no idea where. If this is your idea, please comment so I can link!
I started with a wire organizer from Target. Target is the only place I've ever seen them. I've searched online I can't find it, but it's the squares to make 6 cubes with the white connectors to hold them in place. They are with the wood and metal shelves and other organizers. They are normally under $15 but will go as low as $12-13 on sale. We had 3 sets for each kids' room but when we redid toys we put one up.
Enter hubby and all his many hand tools. He used zip ties and a special thingy that gets them tight and snips off the tail. You don't need the tool, it's just a little easier to get him motivated if there are tools involved.
Just make a 5 sided cube and put a shelf every inch or so where the bars are and zip tie. that's it! I did ask that he put the flush side on the inside of the sides and the bottom of the shelves. One set gave me a cube with 9 slots and another cube with 3 large slots. Not bad for $12! Especially $12 that I spent years ago :)
Because this was difficult to photograph, I stuck part of the newspaper in it to show the shelves. It's going to take me a while to get my cardstock organized in this baby.
Bonus points for anyone who can get crayon off flat paint with only 1 coat on the walls without the paint melting. Extra bonus points for anyone that comes over to help me paint.