How to add a border to a cropped clip?

Hi there,

My project includes multi-track video clips, visually cropped and playing side by side. I'd like to add borders to the cropped clips to increase clarity. Is there a way to do this easily? It seems like I may have to add a shape with a border on top of every clip (I'd like to avoid this if I can).

Thanks in advance for pointing me in the right direction.