Tired of rummaging through the kitchen cupboards for all the small bowls you have whenever you break out a game? Fire up OpenSCAD or use the Customizer to create a collection of stackable magnetic bowls of whatever size pleases you.
You will need 6 magnets per bowl. The default size in the model is 5mm x 1mm, which I purchased from Amazon here. Superglue them into the cutouts with polarity alternating as you go around -- N facing out, S facing out, etc.