I too make smoothies using old fashioned oats without soaking them. And my blender isn't even a powerful one. Heaping handful of frozen mixed berries, 1/4 cup old fashioned oats, 2tbs of flax meal, drizzle of maple syrup, and enough soy milk to make it come together and blend. Tastes even better with chocolate soy milk, but not as healthy.
Oh and if using chocolate soy milk, don't forget to throw in a mint leaf!