From Fitness Generator, a couple of my favorites are:

Power Jacks
1. Start in a shoulder width stance with your knees slightly bent.
2. Jump up into the air and spread your legs out into a wide stance and land in this position.
3. Immediately proceed into a squat and then stand back up into a jump to land with both feet at a shoulder width stance.
4. Repeat this movement for the recommended repetitions.

Single Leg Lateral Hops
1. Start by standing on one leg with your hands on your waist or at your sides.
2. Proceed to hop to the side while maintaining your balance and hop back to the starting position.
3. You can place a rope on the ground or any object on the ground. The object can be small in size and height or large to increase difficulty.
4. Continously repeat for the recommended repetitions

Explosive Pushup
1. Start by getting into a push-up position.
2. Lower yourself to the ground and then explosively push up so that your hands leave the ground.
3. Catch your fall with your hands and immediately lower yourself into a pushup again and repeat.
4. Repeat for the recommended repetitions

* Plyometrics training can be difficult; and ultimately possibly dangerous if not done correctly. Use caution, be careful, and know your limitations when trying Plyometric exercises. If in doubt, consult a Certified Personal Fitness Trainer before trying Plyometrics on your own.