@skyscraper, I strongly disagree. What you are describing to me would be totally amateur and belongs in the 70's. The white background is clean and contemporary. At the end of the day this is not a 1970's disco this is a UAV informational site, the information should be presented in a clear and clean fashion. I believe this has been achieved.
I also believe that the guy's/gal's have done such a GREAT job and I for one am incredibly grateful for all of the hard work that went/goes into the site and Ardupilot.
Earlier this year my company spent a great deal of time and money in revamping our website, through that process we conducted studies on website format and customer retention. The information we got back was that a white background with dark to black text gave the reader a clear and defined experience and the customer was more likely to stay on the page. It also showed that the customers stayed on the page longer and retained more of the content opposed to a none white background. http://black-magic-design.com/index.html
To suggest that you would like to "fix something that is broken for everyone" is some what insulting to the guy's/gal's that have put in the hard work. And from the review of this thread, a position that is not shared by anyone but yourself.
Please feel free to change the presentation of the site for yourself but please don't try and force your views on other members who may not agree. I personally would be very disappointed if the site digressed into 1970's disco drop-out.
As Ludwig Mis Van der Rohe once said "Less is more."