Alternate icon set
From MoodleDocs
An alternate icon set may be used with any Moodle theme.
An icon set consists of a pix directory containing copies of all files from the moodle/pix directory plus a pix/mod directory containing all activity module icons.
To use the alternate icon set
- Copy the pix directory to the theme folder
- Amend
$THEME->custompix = false;
to$THEME->custompix = true;
in theme/yourtheme/config.php