We'll create fresh WordPress site with WP Admin Classic Colors installed. You have 20 minutes to test the plugin after that site we'll be deleted.
If you installed WordPress 3.8 or above and have not found a color scheme you like, menu items are not quite separated, use this plugin!
This plugin adds a new admin color scheme to your WP site, strikes a balance between earlier classical view and new flat view. Colors are similar to WordPress classical light grey and blue colors of admin page, the new color scheme makes visible menu separators between menu blocks and menu items.