Whenever I have leftover, ripe fruit, I always freeze it before it goes bad, and then use it for smoothies. I cut it up into small chunks before freezing it - that way it can go straight from my freezer and into my blender. Yesterday my freezer offered frozen banana and kiwi, and they became the starting point from which my smoothie took form! If you don't have any frozen fruit, I'm sure throwing a few ice cubes in there would do the trick.
Green smoothie with kiwi, melon and spinach:
A small tin of coconut milk (160 ml)
Half a frozen banana, peeled and sliced
1 frozen kiwi, peeled and chopped
A quarter of a galia melon, peeled and chopped
2 handfuls of fresh spinach
Place all the ingredients in a blender an blend until smooth. To change the consistency, add more coconut milk, any other type of milk or fruit juice.