There are some perfect side window blinds suitable for B6 and B7 shape A4, made for the SEAT Exeo.
These are clip in type -rather than the Audi accessory versions where you have to drill the top of the doorcard !! - and are a perfect fit.

SEAT part number 3R0064100a

I've fitted mine to saloon A4, but I believe they also fit Avant models (Exeo ST)

http://www.seataccessories.co.uk/pro...Set_3R0064100A