Here is a list of well known wallpaper sites. Just bookmark them.
WARNING..................Some of you may need to get your parent's permissions before accessing these sites. Some contain adult material.
http://www.deviantart.com/?catpath=customization/wallpaper&order=5
http://www.desktopnexus.com/
http://wallbase.cc/start/
http://www.dreamdesktop.net/en/
http://www.hdwallpapers.in/
http://www.wallpaperfx.com/
http://www.hdwallpapers.net/
http://www.ewallpapers.eu/
http://www.zeusbox.com/
http://interfacelift.com/wallpaper/downloads/date/any/
http://wallpaperstock.net/
http://www.widescreen-wallpaper.eu/
http://www.desktopmachine.com/
Edit: Fixed Prefix tag.
WARNING..................Some of you may need to get your parent's permissions before accessing these sites. Some contain adult material.
http://www.deviantart.com/?catpath=customization/wallpaper&order=5
http://www.desktopnexus.com/
http://wallbase.cc/start/
http://www.dreamdesktop.net/en/
http://www.hdwallpapers.in/
http://www.wallpaperfx.com/
http://www.hdwallpapers.net/
http://www.ewallpapers.eu/
http://www.zeusbox.com/
http://interfacelift.com/wallpaper/downloads/date/any/
http://wallpaperstock.net/
http://www.widescreen-wallpaper.eu/
http://www.desktopmachine.com/
Edit: Fixed Prefix tag.