New CSS background Designs

I need 5 new completely styled background image for my website based around a theme (details will be supplied to sucessful bidder) We want to simply take the existing sites stylesheet, and load in a different image highlighting the new theme on the 5 pages. The site structure and design should not be touched. All that should be changed in the stylesheets are the background images, and the colours. The background image should be the main focal point, be fixed, and highlight the theme in a well designed manner. A simply image swap will not be accepted - samples will be given. The background for the new pages should be very appealing, relevant to the page title, and sit behind the full width of the site. Deliverables Required: 1) Redesign of the background of the existing site across 5 pages i.e. 5 approved designs / background images 2) A modified CSS file that will replace existing pages with the new images included for testing