Art rooms get messy. And if students cannot respect their art materials, it can be very expensive very quickly. You need organization.
This is the design for a series of organisers for coloured pencils. They are designed to fit into the rolling art supply carts that we use at Citadel High. I also made a couple of simple stackable ones for my lovely wife at my old school, Sackville High.
In order to keep it cheap, I like to use construction grade lumber and then mill it down well using a planer and a jointer. I also tend to use the cheap and nasty meranti 1/4" plywood that we have locally. It works nicely.
The pdf below is actual size so that you can print it out in multiple parts as a poster and join it together. But hey, you can shrink it down and read it from there if that works.