Hold one side in an isometric contraction while the other arm moves through a dynamic (concentric and eccentric) movement. You then switch sides.
This simple modification not only helps you to create a new training stimulus, it also creates muscular overload by increasing the time under tension (TUT). By increasing TUT, you increase metabolic stress, a key mechanisms for growth.
If you've only been training for a couple of years, just about anything you do in the weightroom will make you stronger. However, those of you who have been training a bit longer need to pull out the heavy artillery.