This is a render from a project consisting of three pieces. This was from a brief depicting a sci-fi corridor with optimized geometry and before a 500K poly count. I wasn't allowed to use texture only texture values such as emission, roughness, metallic, etc.
The second render is a recreation of the drone from borderlands 2. A MK2 constructor bot. This needed to be a well optimized drone with a limit of 70,000 polys. The drone can only use one material.