Puzzle storage - "Buy some legal size poly expandable envelopes. Remove the string and replace with Velcro circles. Place in a bin. My rule is one out at a time. The envelopes are easy enough for my two year old to open and clean up himself.
DIY Lego table using Ikea Trofast storage system. On the top get a piece of wood or something for students to write on and then turn over to use Lego table. Then in the bottom put Legos in one, paper in other, crayons, etc.