At 250 apparently you can change the color of the bar on the top. 6 more points to go! *Thanks to everyone who voted this up. I can now confirm that this is indeed legit. On your settings page you can enter a six digit hexadecimal number that will change the color of the top bar. I'm going to try some of these out! http://www.somacon.com/cgi/colorchart.pl
http://news.ycombinator.com/topcolors
I made a color map sorted on hues and lightness: http://alteredqualia.com/visualization/hn/colors.png