A basic theme for MODx Revolution based on Twitter Bootstrap (http://twitter.github.com/bootstrap/) + Bootswatch collection of 12 extra bootstrap templates (http://bootswatch.com).
You can change your default template: just add the name of the folder where others template are, for example: instead of default bootstrap template:
<link href="[[++assets_url]]components/themebootstrap/css/bootstrap.min.css" rel="stylesheet">use Cerulean template:
<link href="[[++assets_url]]components/themebootstrap/css/cerulean/bootstrap.min.css" rel="stylesheet">