I have no idea what you're taking about. I see both blue and grey on my screen.
Follow these directions and let me know which skin you're using:
Settings(Up at the top of the page)/General settings(down the left side of the page that comes up)/Forum Skin(down the page 3/4s of the way, click the drag down and select "New Test" and save changes)
Go back to the main page and check it out. Check your profile page after doing that.
let me know what you think of the skin. I think it's a lot easier on the eyes and it makes it so much easier to lighten the profile background so you can read messages easier.
Or... you could just go to the lower left hand corner of your screen and select the style you'd like to use in the pull down menu.
The default is the only one I'd want to use.