Another tasty thing you can try, sort of on the opposite end of the temperature spectrum, is adding some oats, peanut butter, milk, and protein powder (you can mess with the proportions a bit but don't add too much in the way of oats or it will won't blend so well) in a blender and making a slush out of them. Put it in the freezer until it gets to an ice-cream like consistency... mmmm...