If we speak about advertising campaigns, in my opinion there's nothing better than PLATINUM FMD, a brazilian studio which has become famous for their visually astounding campaigns realized with a mixture of 3d, Photoshop and studio photography.
take a look to these previous SeaWayBLOG posts:
In this case it's a campaign for a producer of extractor hoods for kitchen, playing with the bad smell you can have in your kitchen after having cooked some fish....
created by PLATINUM FMD
PHOTO: LEONARDO VILELA
3D: BERNARDO BARBI / LUCIANO HONORATO
MANIPULATION: LUCIANO HONORATO / FLAVIO ALBINO
Agency: Mc Cann
Art Director: Paulo Salgueiro