If you don't have an SVN install to play with next WordPress version (the upcoming 2.5 milestone), someone is here to help. Chris Johnston has set up a WP 2.5 demo site so you can log in the admin area and see what's changing in there. New colors, new look, new menus, new interface: this version will bring a lot of visual changes in the backend.
Log in with admin / demo as a username / password combination, and play around. Don't be afraid of breaking thing, everything is reverted to a fresh empty install every hour or so.
Personally whats wrong wiht the blue interface that we have now? This one is just too simple, and ugly.