Again, I'll go first: I have an small creative boutique ... All the projects we developed so far with this small business are the result of word of mouth referrals. I got phone calls from people I never met, who said that a friend of mine recommended that they call me to help them build an info website, an on-line store, a 3D logo, an e-mail or other type of communication materials. I'm always so happy to get these calls!
The learning here is: be passionate about what you do, be consistent in offering good services/products to your customers, let them tell your stories and learn from them.