Windows XP dropped in 2001 and instantly became iconic—not just for its speed over Windows 98 and ME, but for that default “Bliss” wallpaper you saw on literally every school, office, and home PC. That rolling green hill with the bright blue sky? Shot in Napa Valley on a random day in 1996, no Photoshop. XP kept things fresh with Service Packs 1, 2, and 3 between 2002 and 2008, but the wallpapers were a vibe of their own—bright, simple, and way happier than today’s dark mode everything. If you ever booted up an XP machine, that startup chime and that green hill burned into your brain forever.