Go to the bottom of any page - on the bottom left you'll find a dropdown. That's where you can select from different styles. With enough work I can make the board appear completely different depending on the style people choose.
Some of my thoughts in developing a simpler style was to unclutter it from unnecessary imagery, multiple colors and enlarge some of the text. I kept thinking "clean - neat - simple" - changing colors is quick enough, recreating all the tiny .gif files so they color coordinate can take more time than I can invest in one or two sessions.