I don't have a real to go recipe but just look for what's on hand. The only important thing is: You'll always want to use some fruits that make it "smoothie"-like. Those are for example bananas, pineapple, pears, apricots... If you only use "juice"-fruits you won't get the texture your looking for in a good smoothie.
So what we had on hand was:
- frozen pineapple
- fresh mint
- maple syrup
Amazing smoothie recipes also all over pinterest and here