The Scraponizer case on the left uses the ScrapCessories Cartridge Caddy Tray Insert and the Scraponizer Cartridge insert to store 12 Cricut cartridges. All 12 keyboard overlays will also fit, if you stack 2-3 under the cartridge inserts.
The case on the right uses the 3-part divider to separate the Cricut color ink pens. I labeled each pen with its collection name, then wrote with them all on the index cards to quickly select a color. I've found that the color tips don't really match the actual ink color.