http://bootswatch.com/ provide professional latest bootstrap compatible themes for website designs with all variations. (Dark, Light, Medium).
Media Soft Pro add support for bootswatch themes compatible with bootstrap in all products released 8.0 or later instead of building our own theme.
Main products which support bootswatch themes include
Each product is bundled with all themes provided by bootswatch.
You can set default theme via web.config file under appsettings.
add key="SiteTheme" value="united"/