I came up with a zero carb piña colada. Delicious 

-3 shots rum
-1 shot heavy whipping cream
-1 shot skinny syrup, pineapple
-1/2 bottle of sparking ice coconut pineapple sparkling water
– 1 cup crushed ice (more if your liquids are not cold)
**makes a large serving that is on the stronger side. Reduce shots of rum if you don’t like it strong**