Do you break the “unimportant” rules, like dress code?
There’s a great business book called First, Break All the Rules by Marcus Buckingham and Curt Coffman. And, yes, there are rules that should be broken sometimes. But when you break the rules, there must be a purpose. And that purpose must have some kind of expected payoff.
One place I definitely recommend you avoid becoming a rebel without a cause is in the “little” things. Don’t show up “a few minutes” late. Don’t wear skirts that hit well above the knee. Don’t call the CEO by his or her first name if the unwritten rule is to use more formal address. It’s the little things that make up a culture and if you ignore those rules, it is equivalent to shouting “I care more about myself than the team” or “I don’t want to be here.” This self-imposed brand will not help you when promotion time comes.