Fill a cocktail shaker with ice. Add vodka and coffee liqueur; shake. Pour into lowball glass and slowly top with cream or half and half.
Convert to an Espresso Martini by adding a cold shot of espresso (or cold brew coffee) and a 1/2 oz of vanilla liqueur. After shaking, strain into a martini glass. To vary further, try an Ozark Speedball (House Spirits Distillery, Portland, OR): add a cold shot of espresso (or cold brew coffee), substitute moonshine for the vodka, add a dash of orange bitters and garnish with an orange twist.
Are you a fan of heat? Kick the White Russian up a notch by using chili chocolate coffee liqueur.