I like the negative look too. Looks a lot better at night.
Here's mine. The tank values are in blue, the current values in yellow, and the instant values in white.
I still have to install it to see how it looks in the car. The MPGuino will be hidden, with the external display mounted in the spot for the clock and the mirror DPAD controlling the MPGuino (my car has no clock or power mirrors). I'll post pictures when I get it in.