What I imagine for a Geth form for Ben. It's debatable whether or not he could even scan one, but I think it's more interesting if the Omnitrix accepts living data as a valid species.
Fun fact, with the Geth complete I've now drawn all 10 of the main alien species from the first game.

I've been writing a Ben 10 Mass Effect crossover thing on ao3. You can read it (here) if you want.