I ran across a few photos of a simple, light duty saw horse that I had taken in a Virginia antique store a couple years back. A staked horse like this is not a new idea of course; it caught my because of the narrow beam and aligned leg mortises.
Why the round side is up or what this thing was originally used for I have no idea. If I recall correctly it was around 20″ tall and in the neighborhood of 30″ long.
If made with the flat side of the log up, it would be a fast and simple to make saw horse.