Rina Satou (Mikoto) modeling a Railgun shirt, and Satomi Arai (Kuroko) modeling a Dedicatus 545 shirt. There's also an image of Shizuka Itou (Kaori), but she's modeling a shirt for her role in To Heart 2 rather than in Index.
Also, Mikoto herself modeling the Railgun shirt.
Finally, speaking of figures:
http://news.dengeki.com/elem/000/000/178/178125/
http://www.akibaos.com/?p=5588
