I'm new to the Green Smoothie thing, and I'm still trying to make one that the kids will consume. I tell them it's not a fruit smoothie but a green smoothie, which helps, but still it has to be delicious. I use a VitaMix, which is the only blender I've ever owned that can churn up anything I toss in it.
Carrot juice (from Costco)
frozen spring greens
Delicious flavour, but a little sludgy.