I've been using the Blue Energy Theme by roberj13 for several days now, and I must say I'm very impressed. The notification icons for everything are all custom images, and everything has a nice blue tint to it. With a little customization by using your own widgets this thing is beautiful. Originally it was released as a full ROM, which is what I'm running (screen caps below), but now is available as a theme to go over CyanogenMod or Bugless Beast. Make sure to check out the running thread over at droidforums here.