Thanks for the replies fellas. I'll look at the foam factory and see what they have. I haven't seen the mats at Wally world- but I'll check 'em out next time I go.
Anyone else do this with their boxes? I know the boxes we had in the Air-wing had the red foam. They wrote the serial numbers next to the tools- but you could easily put socket or wrench sizes or something like that with a sharpie (if the foam's light enough for the marker to show up). I just always thought it was sharp looking- and killer easy to locate and determine what tools are missing.