This is a theme for Emulation Station / RetroPie. It is based on the standard Carbon theme but a little more peaceful.

You can see in this second picture that this theme supports kids/favorites/hidden (not shown). To take advantage of this you need to install the emulatationstation-kids experimental package. More information can be found here.

For information on creating your own theme, check out: Creating Your Own EmulationStation Theme

To install, you'll need to download/clone this repository into the right directory, then set it in EmulationStation.

1. mkdir ~/.emulationstation/themes (if it doesn't exist)
2. cd ~/.emulationstation/themes
3. git clone https://github.com/mrnohr/es-theme-cool-blue cool-blue
4. Once the theme is downloaded/cloned. You can use the EmulationStation UI/menus to change to "cool-blue".