I would change the text for the navigation to a more plain serif font (times new romans -ish) then perhaps add some gradients to the header and/or top of the content area.
perhaps for the header you can try working in a photo of a house or something.
You just need to try to avoid making it look too cluttered.
Also, add some padding to the top of the content area.
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With the addition of Me1000's comments, I'd move the house photos under the certified green professional logo and move this logo up. There's a lot of dead space, which can sometimes be nice, but here I think is distracting. I'd then move the body text up to the right of these (rough example attached). This will reduce the line length of the text making it more legible and less hard work to read and get rid of some of the 'dead space'.
Also, the background of the certified green professional logo seems a slightly different colour from the page background and is also slightly distracting.