HD Wallpaper: 3D. Creative. Photoshop. Pirouette Prisoner
If you wish a cool image for your HD desktop background and homescreen phone check this one at full sizes.
Widescreen Desktop / Macbook (Retina): 1920x1200 (fits on: 1440x900)
Samsung Galaxy Tab & iPad: 1440x1440 (compatible with almost all tablets)
HTC, Samsung Galaxy & iPhone: 640x1136 (compatible with many smartphones)