Add the following code to any modules you want to change the background for. You can find out what module and what line of code you need to change using Firebug with Firefox. You need to goto your websites FTP or File Manager to access the template.css file that you need to change the code for.
background-color: #FFFFFF;
So for example.
If you wanted to edit the background of the logo header to red for this website you are on now.
You would find in the template.css file
#s5_logoheaderarea { (When hover over with Firebug it tells me this is the module I want to edit)
and delete any existing background then add:
background-color: #FFFFFF;