I do the water flavouring lollies, you need to make sure the water flavouring is well mixed in, or it sinks to the bottom and makes it a bit sour.
I also make iced coffees, using vanilla shake, but it also works just as well with banana and capuccino shakes. I use 10-12 ice cubes, a sweetener, 400 mls of water, 1tbsp of coffee and whizz it really well with the hand blender. It's lush, I'm addicted to them