After leading over 1100 insane Resistance Bands workouts, I can tell you that there are 3 Biceps Exercises that really stand out: Standing Biceps Curls, Seated Preacher Curls and Lying Biceps Curls with Arms Up. These stand out for me because every time that I add them into one of our Bodylastics Resistance Band Workouts, they just feel like they work the muscle harder and better.
**Always Remember: When you are performing any Biceps exercise, you want to make sure you get full range of motion. In other words you want to fully straighten your arms (lengthen the muscle) and bend your arms (shorten the muscle). As you get tired you're going to want to do little half reps. Half reps do not as much cross-bridging in the muscle, and you won't get the same type of result.
Written explanations are good, but sometimes video is just better. If you want to see the video explanation/demonstration of these exercises click the link: Top 3 Resistance Bands Exercises For Building The Biceps.