I use to make my Green Tea Smoothie with Matcha tea, but because I have not yet been able to find a quality Matcha tea outside of Japan, and since the Fukushima accident I no longer buy tea from Japan(1) ~ I now make it differently.
I brew up a small pot of loose leaf green tea(2) using twice the amount of tea I normally would. I steep for the same amount of time (as I do not want the tea to become bitter), and I use this green tea as the base for my smoothie.
Here are a few of my own concoctions. If you don’t like anything, just leave it out, and if you want your smoothie sweeter, add a couple of extra de-pipped dates, a pinch of stevia, or a teaspoon of coconut sugar.