If you want a different colour scheme than the default to be the 'default' for new users e.g. to match your front end scheme better. then it is fairly simple to set up the scheme on user creation, but takes a couple of lines of code. I documented that here on my blog.

http://llocally.com/blog/2013/12/15/wordpress-3-8-admin-colour-selection/

Hope some people find that useful.