The Aviation is one that is really hard to get in a color other than muddy gray by the traditional recipe. I wanted one with that light purple/blue hue, which would be a much more attractive cocktail to enjoy without being overly floral. I use 2 oz gin, 1/2 oz clarified lemon juice (just pass through a coffee filter), 1/4 oz creme de violette and 1/4 oz maraschino. Then I STIR over ice and strain. The result is as clear as the sky should be for a good day of flying!

Anders Erickson has an interesting comparison. It seems indeed the stirred version has the bluer color. I'll try this out.
https://www.youtube.com/watch?v=Kmw5D32W8sM