This is something I should have thought of years ago... After we were married, my wife bought me a set of Husky screwdrivers. The flat blades had red handles and the philips had black. For many, many years, like any red-blooded guy, I've never thrown away a screwdriver. I have dozens of each type, plus a plethora of others that come with multiple blades. Whenever I'm looking for a driver on the rack or in a drawer, I always have a tendency to look for red or black handles... Since I know which type of blade I need, it's easy to spot the driver and I only have to choose the size. Sometimes my wife's set isn't around and I have to sort through a bunch of drivers to find the right tip.
Tonight, I painted all my drivers, with the exception of my grandfather's wood handled ones, red and black. Tomorrow, I'll line them all up and add a couple of coats of clear to help protect the color.