I dont like the bg at all. Grid patterns look awful in my opinion. I like the gallery but there is nothing in there? You should make your navigation rollover. Also you the red and grey dont look good together in my opinion.
I really like the site. The background goes well with the rest of the site and the colors work well together. Although there were no photos in the gallery, I like the side scrolling when looking at them.
Only thing I could see that you may want to change would be to just use a slightly darker shade of blue for the website name under the "Our Guarantee", it is just a little light and hard to see.
very nice interface, loving the slick metalic look, though the composition is unbalanced on the bottom. balance it with another bar with copyright info