The "Shadow theme" is just a small modification created by AndeOn that was based in the Flat Themes by Andrew Pullins
Special thanks to artist Mozart Couto (testing, choice of colors and composition of splash).
Licensed under the GNU GENERAL PUBLIC LICENSE, Version 2
- Copy the shadow folders into the ~/.gimp-2.8/themes folder of your Home GIMP installation.
- Start the GIMP and accesse the preferences dialog from the menubar, through Edit → Preferences. Now choose Shadow in your theme preference. Enjoy!
Copy the splashes folder into ~/.gimp-2.8/ to got a nicer splash to GIMP
The theme works better on unity Ubuntu desktop and with dark themes.