I do sometimes. My go-to is 1 cup frozen berries, a couple handfuls of spinach, a banana, 1 tablespoon flax seeds, a scoop of unsweetened unflavored protein powder, 1/2 a lime, and about 2 cups of ice water in the blender.
A new one I've just tried is 1/2 cup pumpkin, 1 cup unsweetened almond milk, cinnamon/ginger/nutmeg/cloves to taste, a handful of ice cubes, plus the flax and protein. Very tasty!
I don't do it every day because I crave variety, but I do enjoy it a lot.
Lost the first 100 with Medifast, now working on the last 25