1) Close grip chins (4-8 inches)..a mass builder.
2) Sitting BB curls...rest the elbows between the leg, as you lean forward, with a somewhat narrow grip and curl the bar to the chest.
3) Three position grip curls..Two sets wide as you can...two sets medium grip...two sets narrow grip
4) Cheat curl...extra heavy..bend knees with a moderate heave from the back..Never to the point of making the curl more of a reverse clean. Keep in control the whole curl. There is a fine art to cheating the proper way.
5) Reverse curl..a very overlooked bicep builder..a couple of sets with a false grip (thumbs over the bar) influence the forearms also.
6) Bent over BB curls...like you were to do a curl grip BB row, only curl the bar up to the chest. Can also rest the elbows between/on the knees.
7) Curls, with the elbows resting against the edge of a bench.
BB curls standing with the back and elbows flat against a wall, post, etc. Keep the elbows tight to the sides and against the wall throughout the exercise.
9) A one arm BB curl..standing, center the grip in the middle of the bar..this can affect the bicep in a whole different way...demands much more muscle effort over all.
Good Luck.