Barcode are such an easy way to have some fun, or even extend the brand's identity. Hare are some great examples (vie Amore's blog). Amore designed tha raining cloud for a Korean yoghurt, while Puma's broken cage barcode has been around for a while. There have even been books and blogs dedicated to barcode art.
Barcode flip books by artist Scott Blake, who's also made Chuck Close style portraits of Marilyn Munroe and Jesus Christ out of...you guessed it - barcodes.
Barcode building in St. Petersburg, Russia