Standard themes

Theme selector

An administrator can set a theme for the site in Administration > Site administration > Appearance > Themes > Theme selector.

Different themes may be set according to 'device type' - default, legacy (for older browsers), mobile and tablet.

Go to Administration > Site administration > Appearance > Themes > Theme selector

Click on the "Select theme" button next to the type you wish to change
Scroll down to see the previews of the available themes and click on the "Use theme" button to chose the theme
The next screen will provide information about the theme. Click "Continue"

Note 1: Moodle caches themes so if you don't immediately see changed settings that you were expecting, click the "Clear theme caches" button at the top of the Theme selector page.

Note 2: The selected theme may be overridden if user/course or category themes have been allowed in the Theme settings.

Tip: The MyMobile theme is especially designed for mobile devices.

theme selector showing default and none selected in other theme types

Notes on individual themes

Arialist: does not display the logo at course/course level. This means it is not useful for branding at a category/course level.

Themes that allow you to change a logo

Afterburner (this offers you the File picker to upload your logo)
Arialist (only at home page level) Code to change this: http://moodle.org/mod/forum/discuss.php?d=192409
Brick
Clean (this offers you the File picker to upload your logo)
Formal White (this offers you the File picker to upload your logo)
Magazine
Sky High
Splash