The site has a nice look and feel to it, but when I tried to search for a something in the search box it did not work for me?
I agree that the colours are a little "bright", but for me they do go together well; more of a distraction for me would be the fact that the site title and logo are off centre when everything else on the page is centered. Overall, I find the site to be very well presented; the content pages also look good. I would like to have seen an "about" type page which explained what the site was all about and how it works; the "FAQ" do go some way towards this, but still leave some unexplained areas. I was a little uncertain as to the function of the links that appear under the search box, when clicking them nothing really happened.
I like the graphics and I like the 3 dimensional look of the Rubiks cube. The colors are a bit bright but still look good, Not sure what the site is though? Maybe a short description, might help people who are clueless.