Theres a script running that makes the boxes resize them selves based on how active you are in them.
These are grey because official RPdom games will have full blown banners/images that expand with the box. So as the box grows more of the image gets unlocked.
Ignore the white sidebar it obviously is not done. None RPs will have solid colors like the site announcement forum etc.
Inspired by Windows 8 and the need to be able to utilize all of a user's screen. After this style we will be able to put tons of things on the forum index, before we had to hide games under sub forums etc.