I'm the binder queen, it's true. When I interviewed for my current job, I had a binder with me, and the teachers that sat in on the interview say that's why they picked me. :)
I have a binder for each area of science (earth science, physical science, etc), one for language arts, handwriting, warm ups, small group activities, tutoring, extended learning activities, student information and classroom managers, and of course then there's my sub binder. I'm sure there's more I'm not thinking about right now (since it's SPRING BREAK and all).
Each of my binders have a cute cover. They don't all look alike, because that's boring. Rather, the font I used is somehow related to the topic of the binder, and then I print it out on paper with a cute border.
I have my binder covers on Teacher Pay Teachers for free. Enjoy.