Whew.... for a minute I thought you were going to show some pages you had done in a Dora the Explorer coloring book.
That is a good way to identify things at a glance... for instance, I would put tracer rounds in the ones with the red crayon, green tip rounds could be marked with green crayons, etc.
There you go... different ammo types, different color... dang... gotta strip one or 2 of these