Adaptive Backgrounds - Extract dominant colours from images
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
ColorFavs - Generate color palettes from images, urls or randomly
Unsplash Wallpapers for Mac (Official) - Curated, HD desktop background photos from Unsplash.
Pandacolors - One click color generator with real time preview
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.