Google is testing its new search layout interface, the new look has not gone public, but only for some users. The new look is with a new Google logo, colorful shiny blue buttons and a permanently featured sidebar, something similar (tell me if I am wrong?) to Bing. The sidebar allows to narrow down the search to News, Blogs, Images, Shopping, Video, Maps etc.
Now reload the page (Crtl+F5) you will see the new Google.com look with colored buttons. If it doesn’t work you may need to logout of Google and try again.