I run different patterns on top vs. the bottom. I recently put lights on a Versa Wing, and did one long strip going lengthwise at an angle on the bottom, and two short strips on top of the wing. At night, you can't see the leading edge, so having it pointing in a certain direction, with different patterns, made it a lot easier to identify which way was which.
I've also put different patterns on the bottoms vs. the tops for when we do combat - maroon triangles on the bottom, bullseyes all over the top. The colors might look similar at a distance, but the patterns are easily recognizable and I can determine top vs bottom, and orientation easily.
Plus, I get my wife to use her Cricut machine to make stickers for my planes.