The wallpaper was created in Photoshop and released as a freebie. It comes as a JPG version in different sizes to easily sit as the background. It is available for different monitor screens for desktop, iPhone and iPad.
Resolutions that you can find in the package:
iPad (1024x1024px)
iPhone (404x606px)
2560x1440px
1920x1200px
1680x1050px
1440x900px
1280x1024px
1280x800px
1024x768px
Enjoy and Good Luck!