Here are a few images I had sitting on my webspace already.
The Marimite relationship chart translated into English by a friend
Yumi looking tough with a motorcycle
A not-quite-to-scale image showing how ridiculously tall Kanako is for being Japanese
Youko looking hot in a Pretty Cure/Lillian uniform
Fate Stay/Night/Marimite crossover image
White rose family with enlarged breasts as drawn by the owner of this site http://www.raigou.jp/same/
DBZ parody
One of my favorites thanks to the engrish phrase
Ohno Kanako, from Genshiken, cosplaying as Sachiko
Kasukabe Saki and Ohno Kanako, again from Genshiken, doing Marimite cosplay
Shimako and Noriko in very nice dresses
Humorous Shimako wallpaper
Some artist's vision of third-year Yoshino, Yumi, and Shimako