I have this bottle of violet liqueur that has been sitting in my liquor cabinet untouched, which felt wrong. So I started experimenting and this is what I came up with. Not too sweet, light and refreshing.
1.5 oz vodka
0.5 oz violet liqueur
2 dash orange bitters
2 oz seltzer
In a shaker with ice, stir together vodka, violet liqueur and bitters. Pour into a rocks glass over ice add seltzer.