I worked it out lol, sry for slow reply..

The theme had white background in the blocks (php-nuke) i wanted to make them grey....i didn't see at first the blocks.html in the theme folder.
So i just changed it there.

If i went to the background colour in the theme.php

$bgcolor1 = "#d5d5d5";
$bgcolor2 = "#7b91ac";
$bgcolor3 = "#ffffff";
$bgcolor4 = "#d5d5d5";
$textcolor1 = "#000000";
$textcolor2 = "#000000";

and change these, it will only grey some blocks like the banner, tools area outter page frame....not the left and right blocks.

www.nova-outpost.com
is my site i was on about, see how now i have grey left and right sides inside the blocks.