gpi-theme-menu

Follow these instructions for update function to work:

Create the /home/pi/RetroPie/retropiemenu/gpitools/ directory

Put the theme_menu.sh in the /home/pi/RetroPie/retropiemenu/gpitools/ directory

cd /home/pi/RetroPie/retropiemenu
mkdir gpitools
cd gpitools
wget -O theme_menu.sh https://raw.githubusercontent.com/bebeidon/gpi-theme-menu/master/theme_menu.sh
chmod 755 theme_menu.sh

The theme_menu will now appear in emulationstation under the Retropie section in the GPi-tools folder. For a more appealing look, read on.

Follow these instructions for new icons to appear

The icons for the GPi-Tools folder and more GPi specific icons will be downloaded by the theme_menu. You will have to edit your gamelist.xml in /opt/retropie/configs/all/emulationstation/gamelists/retropie/ to include the new images like this:

    <game>
        <path>./gpitools</path>
        <name>GPi-Tools</name>
        <desc>Various tools for GPi</desc>
        <image>./icons/gpitools.png</image>
    </game>
    <game>
        <path>./gpitools/control_updater_menu.sh</path>
        <name>Control Updater Menu</name>
        <desc>Xboxdrv - Advanced Framework Updater by Adam.</desc>
        <image>./icons/controllertools.png</image>
    </game>
    <game>
        <path>./gpitools/theme_menu.sh</path>
        <name>GPi Theme Menu</name>
        <desc>Theme Menu for GPi by bebeidon</desc>
        <image>./icons/theme_menu.png</image>
    </game>
    <game>
        <path>./gpitools/Kernel_Boot_Logo.sh</path>
        <name>Kernel Boot Logo</name>
        <desc>Change the Boot Logo before the splashscreen/video</desc>
        <image>./icons/kernelbootlogo.png</image>
    </game>

Install / Update themes only works while connected to the internet

Changing the theme when previously downloaded can be done offline