In the intro to Shirobako, the girls are shown flying in fighter jets. Each of them has a design under the cockpit - presumably related to the characters.
I can't figure them all out though.
This is the easiest one, the two toys are delusions of Aoi's that she interacts with often during the show.
Shizuka's plane has the pig with a plum-shaped nose. This was the character that she got to play in costume during one of the episodes.
Misa's plane has a depiction of a penguin - from the show that inspired her to join the company she was making tires for.
However, I don't know what the final two are referring to.
Did I miss something obvious? Any ideas how these pictures / characters are related to the cast?