I've been meaning to try this for some time, and I finally did. I was a bit apprehensive at first, because I usaully associate avocados with salty, Mexican style flavors, but I was very pleasantly surprised at how good this was.
Avocado really is a versatile food, and this is super quick to make. Even with my crappy blender, it only took maybe 10 minutes from start to finish.
1 cup ice (or more depending how thick you want it)
1/4 cup soy/rice/almond/hemp milk (I prefer hemp milk)
2 tablespoons agave nectar
2 tablespoons coconut milk (optional)
Preparation is simple. Pour in the milk, avocado, coconut milk, agave nectar and blend till smooth. Add the ice and continue blending till you get it to your desired consistency. Also, feel free to add agave or coconut milk to your desired taste.