xSwatch is a theme for XOOPS 2.5 that is based on Bootstrap 3.3.7.

The main theme is based on Bootswatch Cerulean, and a dark alternative is based on Bootswatch Slate. Theme specific templates are generally compatible with and in many cases borrowed from xBootstrap.

Features:

emphasis on better mobile experience
self hosted, with no off domain resources required
built in EU cookie compliance
administrator toolbar with block edit feature

Customize xSwatch:

customize the Navigation Bar in tpl/nav-menu.tpl and language/*/main.php to match your system
customize the Jumbotron in theme.tpl
for best experience install both the PM and Profile modules
to enable the dark theme, copy the contents of the css-dark directory to the css directory.
alternate Bootswatch themes can be swapped in easily by coping the theme's bootstrap.min.css into the css folder.

Credits:

Twitter Bootstrap - Bootstrap
Angelo Rocha - xBootStrap
Thomas Park - BootSwatch
Silktide - Cookie Consent
Klaus Hartl - js-cookie