4K HD Wallpaper: Red Demons
Carles Marsal is the artist of this super digital art image and from his courtesy was featured here and available for download under various sizes. Check which how looks on your desktop backgrounds and homescreen phones if you like it.
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x2048 (compatible with many tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many phones)