Check these out. A Spanish user (AZ user: elgino) added LEDS to the front and rear of his B7 Avant. It's a clean install for sure, almost factory-like. The S5 wheels, RS4 grille and mirrors look really good too. If there's a textbook for OEMplus modification, this guy should be a contributor.
Original AZ Thread
Here's a how-to in Spanish.