Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Christmas Design Assets by Iconfinder - Sprinkle up your seasonal content with these festive goodies.
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
Creative Market - Buy and sell handcrafted, mousemade design content like vector patterns, icons, photoshop brushes, fonts and more at Creative Market.
Splashify - Beautiful desktop wallpapers for Mac and Windows
Christmas HQ - Totally free holiday icons, images, borders and fonts