I couldn't get a horse. It was a horrible drawing, though.
1. Make a sketch of your choice 2. Pick the first AutoDraw suggestion (or randomly one of the first N) 3. Feed that to google image search 4a. Google's best guess for this image is a prompt for the next human sketch. Repeat from 2. OR 4b. Pick a sketch-like image from the results of 3 and reproduce on the AutoDraw canvas. Repeat from 2.
I got an amazing result on my first attempt at 1 - 3:
Autodraw (Cat > Raccoon): http://imgur.com/a/Fy00K
Google Images (Raccoon > "Suppression of Enemy Air Defenses"): http://imgur.com/a/F3z1T
It'd be hilarious to automate this, set it running, and just watch it go.