Zedge offers a massive library of user-uploaded content with a specific category for robot backgrounds.
“FINALLY some 1920x1080 wallpapers and these are actually pretty good.” Reddit · r/MrRobot · 9 years ago 1920x1080 Robot Wallpapers | Best Wallpapers
For a cleaner look, some users prefer close-ups of mechanical parts, circuit boards, or simple line art of robotic heads. Where to Find High-Quality 1920x1080 Wallpapers Zedge offers a massive library of user-uploaded content