Jeff (not sure of his handle on here anymore, it used to be JetDriver) did some nice things with clear lenses and LEDs. I'm sure he can get you the link for what he did.
I didn't really do anything to change the external look of the lighting system- it's all LED trickery inside the stock housing. It's all meant to be safety enhancing, not customizing for customizing sake. Having said that, I'll see if I can't dig up the list of what I did. One external change I did make was adding a license plate holder exactly like JimC's photo, except I mounted mine upside down so the LED strip (very bright, by-the-way) is on the bottom.