The top shelf contains 2 large magazine holders: the one on the left contains paper, cardstock of different colors, stickers, empty notebooks (bought and handmade) and a clipboard in case they want to draw somewhere else. These are refilled and rotated periodically. The magazine holder on the right is for finished project that do not go on the wall. As you can see, I have just cleaned it up! I clean it up every time it gets full.
On the right of the magazine holder, we have loose parts (right now googly eyes, pompoms, and gems), glue for the loose parts, markers, crayons, scissors, string, and washi tape (this is a huge favorite!). In addition you can see the foam paintbrushes with the markers... I would typically keep them with the paint below however, Theo loves chewing on them, which is dangerous so they are on the top shelf, away from him until he stops mouthing.modeling beeswax (sometimes we alternate with Wiki Stix, but Alex tends to use them all in half a day so we run out fast and often!), hole punches, and stamps, that rotate with the seasons.
The bottom shelf is for play dough (we have both homemade and Playdoh) and kinetic sand. The tray in the back contains all the play dough tools.