Good Free Photos - Large free stock photo site with thousands of public photos
Wallhaven - Your source for the best high quality wallpapers on the Net!
WallpapersCraft - HD & 4K wallpapers
InterfaceLIFT - High-resolution widescreen wallpapers, desktop icons, and themes for Mac OS X, Microsoft Windows...
Unsplash - Unsplash is a website with high-quality free HD images. It has a catalog of more than three hundred thousand striking images that are neatly organized with tags. Read more about Unsplash.
Simple Desktops - A collection of wallpapers designed to make your computer beautiful without distraction.