I've tried using Dalekium's suggestion of "greyscale negative" for making my own, but it doesn't have enough contrast. one of the best Aztecs I've seen is on an akula put out by DrMcCoy1701 (which is pure Black and White high contrast)
yes, I'm looking for a how to for the aztecings for hulls, saucers included, as I'll need them for my own ships anyway. in this case, HOW to create the patterns.