I love this idea from Inspired Edibles. Make them up, freeze them and then you just toss in the blender with your liquid and you have your smoothie all ready to go. You can drink it then or take it with you. What a fantastic time saver.
Vanilla Blueberry Almond Smoothie Cups
http://www.inspirededibles.ca/2012/09/vanilla-blueberry-almond-smoothie-cups.html