From "My Man's Belly", a different use of Creme de Violette aside from endless gin drinks. Original recipe here: http://mymansbelly.com/2011/03/11/springtime-in-a-glass-the-boulevard-cocktail/
This version, using Tempus Fugit's Creme de Violette, which is less sweet than most, has a Creme de Violette float, because TF's doesn't sink, having a lower specific gravity than most sweeter CdVs.
Also, the amount of agave made the cocktail unaccountably sweet to my taste, so cutting that down, and with 3 oz total booze in the original recipe, I've scaled down by half. And, I also did some household subs due to lack of some ingredients.
Pre-chill 4 to 5 oz coupe glasses. Shake vodka, St. Germain, lemon juice, calamansi tincture, and orange bitters with ice. Pour through shaker top into glass. Use spoon to float Creme de Violette on top.