“Ben 10″ (Original Series) - Stinkfly Art from Comic Con 06 Artbook
Another alien they seemed to be pretty indecisive over, there’s 6 alternate designs here, and they all have the 3-Circle Omnitrix.
This image was featured as an unlockable piece of Concept Art in the PlayStation 2 version of “Ben 10: Protector of Earth”, this is a scan of the physical version