Change the theme of the root user easily in Ubuntu

You should need a program called "Ubuntu Tweak" to do the trick easily. Get it from here.  After installing it Go to Applications --> System tools -->  Ubuntu Tweak.  Then go to Security Related (in System ). In there under Miscellaneous options you'll find an option Fix appearance of programs when granted root privileges( If the option is greyd out click on "unlock" in the bottom and enter the root password). Tick it and everything is done ..!

Adding a caps lock/Num lock/Screen lock indicator in ubuntu

You will be in big trouble if your computer ( specially laptops) doesn't have indicators for  caps lock/Num lock/Screen lock. So to get over this problem you can install an applet called "lock-keys-applet" from Synaptic package manager. And add it to the Gnome panel. Then you'll get indicators for caps lock/Num lock/Screen lock. Cheers...!