I confess that I bought a bottle of creme de violette in order to see what an aviation tastes like. I used a standard recipe which I see a lot, and I was not fond of the result (too much violet). I played with it and eventually came up with this: 60 ml gin, 15 ml maraschino liqueur, 3.75 ml creme de violette, and 15 ml lime juice (not lemon). I used Aviation gin, and a different gin might require changes to the recipe.