Sevendie is an admin theme based on the Drupal core theme, Seven.
Very often have to work in the administrative interface, and this theme allows you to do it with great comfort. Besides, it's nicer on the eyes than the standard theme Seven.
How to use it?
Go to admin/appearance/.
Enable Sevendie.
Under ADMINISTRATION THEME at the bottom of the page, select Sevendie from the dropdown list & save.