Do you like your dentist? Did you have a good experience with the realtor that sold you your house? Call them up and ask if they pay a referral fee for new clients. Ask them if they belong to a networking club and if you could come visit it to see if it was for you. Go and learn from that experience. Then write down on a separate page in your notebook a list of professions who always need new clients. By those professions, write the names of the people you know who practice that profession. You have a great start at creating a passive income stream, because you don't do much except recommend people you already like to people you also already like. It is a win/win/win situation! Bonus!
EJ runs a publishing company and she pays $50 for every author who signs with her. Usually it is only her other authors who do this for her, but she is willing to pay this for anyone who successfully sends her an author she ultimately represents.