Classic blueprint blue or modern "dark mode" slate with white/yellow technical lines.
If you use SolidWorks, Autodesk Fusion, or CATIA , export your own assemblies. Set the custom resolution to 2560x1600 and use a "Technical Drawing" or "Raytrace" visual style. 2560x1600 Mechanical Engineering wallpaper. ide...
Search for "WQXGA" or "16:10" tags on high-end wallpaper sites like Wallhaven or Unsplash. Classic blueprint blue or modern "dark mode" slate