1. Mix 1 1/4 cups water with aperitif or liqueur (amount will depend on the desired color; see next step for measurements). Pour into the bottom piece of ball-shaped ice cube tray. Snap top on, and freeze until solid. Repeat to make additional balls.

2. To make the colors shown, mix 1 1/4 cups water with:
1. 2 teaspoons creme de cassis
2. 1 tablespoon Aperol (a bitter orange liqueur)
3. 1 tablespoon Galliano (an herbal liqueur)
4. 1 tablespoon Creme Yvette (a violet liqueur)
5. 3 teaspoons Aperol
6. 2 teaspoons Creme Yvette
7. 2 teaspoons Galliano
8. 3 teaspoons creme de cassis