However, what was really interesting was that all of the portable kits I saw were BLACK. All black. Barely a fleck of color anywhere. It reminded me of the picture below:
Not black ? Sacrilege! Keel-haul the scallywag! At the very minimum, place some photoluminescent marker tape around the perimeter so that you can find it when the lights go out. A bit of highly reflective (i.e. retroreflective) marker tape along side the photoluminescent tape would be a good idea, too - this way if you shine even the weakest of flashlights in the general direction of the toolbox, it'll light-up like a fireworks display and you can grope your way toward it a bit easier. There is a reason that Firefighters and Liferafts both have SOLAS* type marker tape on them - so they can be seen under the worst of lighting conditions.
*SOLAS - Save Our Lives At Sea - Solas type marker tape is commonly used on road signs and highway barrier marking because it does such a darn good job of blinding you with your own headlights.
So, how about some alternatives? OK. Lets try these: