Microsoft Design site has a ton of attractive wallpapers, retro and otherwise.
Nathan Huening on LinkedIn: Today I stumbled upon Microsoft's 4K
Bliss: a Windows XP inspired wallpaper collection
4K Graphic Wallpapers - 4k, HD 4K Graphic Backgrounds on WallpaperBat
Wallpaper Windows Xp - Colaboratory
Official Microsoft Wallpapers - 4k, HD Official Microsoft
Windows Xp Green Hills Theme - Colaboratory
Windows XP Desktop Backgrounds - TJ Kelly
Is there software available for a Windows PC that changes the
Microsoft Windows XP Wallpapers - Top Free Microsoft Windows XP
One Microsoft Way (@OneMicrosoftWay) / X
Wallpaper For Pc Xp - Colaboratory
Microsoft official releases 4K compatible version of 'Windows XP
HD wallpaper: Landscape, 4K, Bliss, Windows XP, Stock
HD wallpaper: Landscape, 4K, Bliss, Windows XP, Stock