osConcert has four starting templates...possibly more later
'lightzone' (green default) 'darkzone' (blue/black) and 'theevent' (red) and restaurantly
Both are ‘responsive’ for cellphone and tablet viewing and are styled with the very powerful ‘Bootstrap 5+’ by ‘Twitter’
In Admin>Shop Settings>Templates>(template)>EDIT
DEVELOPERS: You can create other color themes editing a css stylesheet: templates/