Squatting or benching with the bands wrapped around the top of the bar from the floor is one way to use them for resistance.
An opposite example and a fun one is the reverse band set-up. This can be done almost with any lift. You will need a power rack to set-up the desired lift correctly. Bench, pull-ups, dips, squats, hang cleans, deadlifts are just some of the exercises that can be aided with bands.
My personal favorite band lift is the reverse band deadlift. The bands help the most at the bottom, breaking the weight off the floor. Then the tension decreases as the weight gets closer to being locked out. I find this to be a big confidence builder getting you used to handling heavier weight than normal.