Admin Icons allow to replace original icons with an another set. (from WordPress.org Project Icon) or your personnal creation.
The Admin Icons plugin can be installed in 3 easy steps:
1. Unzip "Admin Icons" archive and put all files into your "plugins" folder (/wp-content/plugins/) or to create a sub directory into the plugins folder (recommanded), like /wp-content/plugins/admin-icons/ 2. Activate the plugin 3. Inside the WordPress admin, go to Options > Admin Icons, choose your icon set, and save your preference.