WP Admin Classic Colors lets you bring old WordPress admin classic colors to new WordPress 3.8 version. Much similar to WordPress classical light grey and blue colors of admin page.
Install and activate WP Admin Classic Colors plugin. Upon activation visit your admin area Dashboard -> Settings -> WP Admin Classic Colors page and tick the checkbox to enable classic color scheme. Now you can use the color scheme from Dashboard -> Users -> Your Profile page.
It 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.