Sometimes you can only rebel in small ways; when I was in college, I worked at a job I hated (the boss was a jerk!)... I secretly wore red socks instead of black with my uniform...only I knew it, but it felt GREAT! Very rebellious!

AND, you can't forget the small black arm bands sported by a group of U.S. students in the 1960s that forever changed American public school law and slowly did away with strict dress codes for students and faculty (I'm not saying this was a good thing, but it DID change history!). It also ushered in the students' rights movement in the united States. From small gestures come great things.