Good idea for button storage! A rotating spice rack for small craft and office supples. I picture myself never searching for a safety pin, paper clip, small highlighter, etc. Everything is right at your fingertips.
Paint holder: two wire shelves from one of those wire shelving units and zip tied empty thread spools in all four corners and the middle to keep them together, yet spaced apart enough to hold craft paints (kind of wine rack style).