Feeling the need for a new geeky/nerdy background? Why not check out this album with 150 images http://imgur.com/a/x6sRL?gallery#0
Bing is also an infamous source of great wallpapers (if not great search results). They feature a brand-new wallpaper-worthy image as their webpage background every day. http://www.istartedsomething.com/bingimages/?m=6&y=2009 For Windows machines, you can automatically cycle through Bing wallpapers: http://windows.microsoft.com/en-US/windows/bing-dynamic-download-theme
If only I switched my wallpapers somewhat frequently. I pretty much use the same one for years unless I find one I really like.
For those with Dual Monitor Systems I present to you yet another album for wallpapers http://imgur.com/a/N3645?gallery#0
And what about us triple monitor people? I just decided to look for a new desktop. Been using the default Windows one. Here's a website with triple monitor backgrounds and more. http://wallbase.cc/toplist/0/12/eqeq/5760x1080/5.33/100/32/0 Here's an awesome one. Pretty bad ass even if you don't like WoW AND OMG TAYLOR SWIFT The links are broken. Here's a direct link. Star Wars http://wallbase.cc/wallpaper/1145705 WoW http://wallbase.cc/wallpaper/1290130