Here’s an idea to motivate law firm employees:  Give the “Employee of the Month”  the keys to the company car.  From Autoblog:

[At Infusion Software], if you're deemed the month's top performer, you get the keys to the "Infusion Z," the company's silver Nissan 350Z. The car sports the Infusion logo on the door, so they get some free advertising wherever the Employee of the Month drives. That's a fair trade if you ask us. When you're cruising in the Z, it's not like you can see that from the cockpit, anyway. Oh, and should an employee get into an accident with the car, he or she has to pick up the insurance deductible.

What kind of car should law firms use?  A Mercedes, a BMW, or perhaps a Bentley?  What kind of car would motivate you to bill those 220 hours this month?