My new favorite frozen treat is:
1/2 lb. frozen raspberries + 1/3 can coconut milk + 5 pitted dates in the Vitamix.
This tastes like frozen yogurt, and the tartness of the raspberries is balanced by the sweetness of the dates and the creamy coconut flavor. You can use other kinds of frozen fruit instead–strawberries, cherries, blueberries, mangoes. With mangoes you probably need fewer dates.
Another longstanding favorite is:
2 frozen bananas + 1/2 can coconut milk + dash of vanilla extract in the Vitamix. Serve with a dash of salt to bring out the sweetness.
This is a good one for bananas that are getting overripe–peel them and stick them in the freezer in a ziploc bag, and then you can use them for smoothies.