These are examples of the default color themes available with the Tag Groups plugin.
Green
Use this class to add this green style: tag-groups-theme-green
Blue
Use this class to add this blue style: tag-groups-theme-blue
Red
Use this class to add this red style: tag-groups-theme-red
Orange
Use this class to add this orange style: tag-groups-theme-orange
Black
Use this class to add this black style: tag-groups-theme-black
Dark Red
Use this class to add this dark red style: tag-groups-theme-darkred
Midnight Blue
Use this class to add this midnight blue style: tag-groups-theme-midnightblue
Slate Grey
Use this class to add the Slate Grey style: tag-groups-theme-slategrey
Tag With Hole
Use this class to add this yellow style: tag-groups-theme-tag-with-hole