Ok, so there are now 3 really cool themes available for your pdnforum.com viewing enjoyment:

Aero Blue (the default when you first wander in here)

Aero Red

Element Green (for you gamers and goths - a DARK theme)

to select a non-default theme, just go to your User Control Panel up near the top left, choose "Board Preferences"
and under "My Board Style" click the dropdown and select.

Enjoy!