Hi
 
I am using classic light blue. I want to chnage the colour of the background on the blocks and main page. I would also like to remove the title on the blocks - where do I find this in the CSS

A very good way of identifying css elements is to use Firefox as your browser and Aardvark or similar extension.
Aardvark, when started, will identify elements as you move the mouse over them.
 
Another tool (Mac/Windows at the moment) is Stylizer - http://www.skybound.ca
 
HTH

in relevant style sheet create or edit .commonbg to have a background color of eg: #000000
 
styles/yourtheme.css
 
e.g.
.commonbg
{background: #000000 ; background: url('/images/black_bg.jpg') repeat; width: 100%;}
 
Background colour also applies beneath the blocks and not just to the left or right of them so can be ugly

< remove the title on the blocks >
 
When you create a block leave the field " Block Title " empty.
 
Chris