Home blog Unclutterer has a great way to quickly figure out of your wrenches or sockets are metric or SAE: wrap a line of brightly coloured electrical tape around the handles of all the metric or all the SAE tools. When you're looking for a specific tool this method can eliminate half the potential tools you're looking through to find the right one.
Photo by Emilian Robert Vicol.
You can also use this method with screwdrivers by picking one colour of tape for slotted, another for torx, a third for Phillips, etc. Any other suggestions for other things this method could be used to help sort? Post them below in the comments.