Not my creation, but good enough to warrant re-publishing here.
Triple Espresso Martini
1 1/2 oz. Three Olives Triple Shot Espresso Vodka
1 oz. coconut rum (Malibu)
1/2 oz. Amaretto
Shake rum and amaretto with ice, strain into a martini glass. Shake vodka with ice and layer into the glass on top.
The recipe suggests a chocolate rimmed glass but, hey, enough is enough.
The layering effect, as you can a bit of in the picture below, is pretty cool.