This patch provides a new feature to users of Moodle's SSO capability.
If you allow users from a remote Moodle to SSO into your site, you can choose a different theme for those users, so that your site is branded differently for them.
When you SSO to a remote site, you may find that it is branded with your home Moodle's theme, or co-branded with collateral from your home Moodle and the remote Moodle.
How to configure:
In the normal peers administration page, a new tab appears titles "Themes". This leads to a page similar to the familiar "choose a theme" page.