I bought some Popsicle holders at the store the other day. I missed buying them last year, they seem to be a seasonally only item. I mixed up a batch of our usual strawberry protein shakes and decided to freeze them as pops. My shake recipe is pretty easy and you can sub just about any component.
1 scoop of vanilla protein powder
water or milk
Mix in the blender, and pour into the molds. I did find that you might have to let the shake settle, as the blender adds lots of air into the mix, which doesn't freeze very well in the molds. They taste delish!