I think every coach has a way they coach free throw shooting, usually done towards the end of practices to simulate the fatigue factor. Here is one that I read from the Basketball BC website which is worth using to switch things up a little from what you might normally use.

Jay Wright Free Throw Drill

Divide the team into pairs and send each pair to a basket. The players will shoot free throws in this fashion: 3 in a row, 2 in a row, and 1. This will simulate the number of free throws they could get in a game i.e. fouled on a 3 pt. shot, fouled on a 2 pt. shot and fouled on a made basket. Total the number of free throws each pair makes. The losing teams may have a suicide, push-ups, etc. as a penalty.

If you like Coach Jay Wright, then check out Jay Wright's DVD on Innovative Late Game Sets. Coach Wright is the head coach of the Villanova Wildcats of the NCAA.