Lately my favorite non-dairy frozen treat is a simple frozen fruit sorbet: I push frozen bananas, pineapple, and strawberries through my Champion Juicerand out comes perfect, creamy sorbet with no added sugar.
But before I switched to sugar-free, I used to make luscious non-dairy ice creams using a Krups La Glaciere Ice Cream Maker and the book Vice Cream: Over 70 Sinfully Delicious Dairy-Free Delights.The recipes are simple and far better than any vegan ice cream I've bought at any store. The "milks" are from nuts, which give the ice cream a rich, creamy sweetness. Chocolate pecan was our favorites, but once you understand the basic proportions you can make practically any flavor you like.
In case any of you are interested, I'm selling the ice cream maker and book together as a set on ebay. I hope they go to a good vegan home, one that will use them to make many, many wonderful, non-dairy delights.