Post some wallpapers that came with operating systems in the 90s to early-mid 2000s. 4:3 and 1600x1200 or greater preferred. And feel free to post photos that aren't default wallpapers but were taken on film and are from that time period and which make good computer wallpapers, 1600x1200 or greater preferred.

This one is from the Windows 98 Plus! wallpapers.