My basic smoothie goes like this:
-2 kinds of fruit (I mix frozen, fresh, and canned)
-about a Tbsp of flaxseeds (not always, it makes the smoothies very thick)
-some kind of green (depending on if I have any on hand)
That's all you need! There is no need for anything fancy. I mix canned and fresh fruit because fresh fruit is very expensive here. The combinations are endless and I've only had a few that I had to 'choke' down. So word of advice, cantelope doesn't really work in a smoothie.
I'll show you a few of the ones I've made.