There are a lot of variations but here are some I use:
Box Pushups - Push up to increasingly higher boxes
Box Drop Push Ups - Drop from the box to the floor in pushup position and do a push up to get bck onto the box as fast as possible, think the ground is on fire.
Medicine Ball recoils- MEd Ball is dropped from chest or head height onto you who is laying on the ground with your arms extended, the ball is caught with your arms extended and returned as fast as possible, think the ball is on fire. Also you can let the ball come down and touch your chest as well.
Bench Recoils, if you have access to equipment that will make it possible, you can do the med ball recoils with the bench press, this is about the best power development movement for the bench plane. You are forced to absorb the shock and create a force as fast as possible, with no eccentric tension or hyperextension from the bar deccelerating.