Nothing is more satisfying that foam cutouts for tool boxes. (Typically used in shops/labs where foreign objects are detrimental to a product being worked on. This ensures all tools are accounted for.) :
ONREVA Tool Box Foam Organizer, ToolBox Shadow Foam Organizers, 18x12x2 inch Tool Chest Drawer Foam Inserts, Kaizen Foam Sheets for Packout Case & Stackable Storage System, 3PCs Set - Amazon.com
Socketed Screwdriver Tool Drawer Insert Organizer Red Black Foam Tray | eBay
Kaizen Foam Sheets and Inserts | Custom Kaizen Inserts for Toolboxes – KCI Tools
Tool Box Organizers – 19 Tips & Hacks for Your Tool Box | Creative Safety Supply