These are some handy tips:

a) apply for part time at Starbucks or any other fast food outlet
b) if you are really hardworking, you could work the graveyard shift for McD Drive-in. Some really opens till late, 3am ish.
c) learn a skill, like web development or illustration. Write or draw comics!
d) work part time for banks, doing telemarketing or customer service. Maxis is a good choice too.