Backdrops - The only wallpapers you'll ever need. Say hello to Backdrops.
UI Movement - The best UI design inspiration, daily
WallpapersCraft - HD & 4K wallpapers
Design Hunt - Curated design inspiration for everyone
Pitch Black Wallpaper - Pitch Black Wallpaper is an application, allowing you to set the pitch-black wallpaper to your smartphone or tablet.
UI Jar - Hand-picked design inspiration for your real life projects