Strategic alliances. When I first started my business, I connected with a business/personal development coach as well as PR firms. The business coach had clients who needed my social media marketing services at the time. And the PR firms had tons of clients coming to them for press and inquiring about social media. It was a value add for them to refer me to their clients. Depending upon the kind of consulting business you have, could you connect with accountants, lawyers and other professionals servicing them? That would be my reccommendaiton.