If you're running the standard Raspberry Pi OS, your system already has a library of high-quality wallpapers hidden in the file system. You can find these default images at /usr/share/rpd-wallpaper .
: Navigate to Preferences > Appearance Settings .
: Many open-source dashboards, such as Home Assistant and custom Python GUIs, render cleanly at this resolution without the blurring or "stretching" often seen when forcing a Pi to output to non-native panels.
: Sites like WallpaperAccess and Pinterest host specific categories for "Technology" and "Raspberry Pi" at the exact 1280x800 dimensions.