Most colleges ask for teacher recommendations.
The reason they ask for their opinions is because teachers get to know you personally and academically. For the most part their comments are fairly positive. So I'm going to take a leap here and say that you won't have a difficult time finding someone to say something positive about you. In fact, most admission officers will tell you that positive recommendations are about the only kind they read. Talks about the depth of your commitment and doesn't simply provide a list.