One way to get some fun clients is by doing graduate portraits.
It is important, as a photographer, to be able to compose a good portrait and to enjoy taking them. Taking graduates is fun because you get to interact with a fun, young, excited client. As you shoot you should really try to get to know them better and show that in your work. A way I have found to help a client be comfortable is by taking them outside and using natural light combined with a soft box or reflector. The fresh air seems to relieve some tension. One person who does this really well is Danny Santos; check out his work.