More block regions

Is there an easy way to change the background color for each menu-block?

I assume you're just wanting to set a different background colour per block... To do this, simply add something like the following to a 'custom.css' file in the theme (you may need to clear your theme cache before the changes will take effect):

#block-user-1 {
  background-color: #ff0000;
}

Can it be possible to divide the center region in 2 or more regions.

TOP.................................TOP
LEFT CENTER1 CENTER2 RIGHT
LEFT CENTER Right
FOOTER .....................FOOTER

It is possible to do this yourself (either by creating a new sub-theme of Scaccarium, or editing Scaccarium directly (though this will affect future updates to the theme)). I used negative margins to create the sidebars in this theme, so you could probably do something similar to that, though I can't give you the exact code. Take a look at that article and have a play with the HTML and CSS to get the effect you want.

Marking as fixed.