HD Wallpaper: Windows 10
If you're looking for an HD image with the new Microsoft operating system, check the newest creation from Luis Jorge. The image is optimized here for fit on tablet and desktop backgrounds.
Widescreen Desktop / Macbook (Retina): 1920x1200 (fits on: 1680x1050, 1440x900, 1280x800)
Samsung Galaxy Tab & iPad: 1440x1440 (compatible with many tablets)