Avocado Smoothie

This is the result of boredom near an idle blender, and it has become a regular thing for us.  The texture is exquisite, silky, and like nothing else.

For one smoothie, throw into a blender:
3 ice cubes
1 ripe avocado
a good splash of milk (almond milk etc is nice here)
a good squirt of lime juice
sweetening of choice. 
Blend like you've never blended before