Hope you don't mind me sticking my nose in - the red background was what kept me from moving to DW at first, so I had to ask around for that one myself.

Go to Home -> Organize -> Manage account, click on the Display tab, go to Site Scheme, and pick anything that's not "Tropospherical Red" (I'm a fan of the purple myself, but there's a few to choose from) Then just click Save.