Here's the one that goes on the door switches:
http://www.mazda3online.com/product_info.php?products_id=225
A similar one goes on the dash horizontally from the LCD screen all the way to the passenger's side door. Red, blue are available from the dealer for both of these (door switch cover plate and dash strip). The 3 with the 2.3L engine come with a "carbon fiber look" dash strip, standard, while the door switches are matte black. The ones with a 2.0L engine have a glossy black dash strip and matte black door switch covers.
IMHO, the red and blue dash accents are tacky and overpriced. The "CF look" strip standard on the GT looks nothing like real CF. I swapped it out for the classy looking strip on the 2.0L models.