Depends on the field. We tend to try to offer complimentary services - e.g. if you do web, typical clients might be companies that do embedded, and need a web UI. Or who do mobile usually but now need some web expertise, etc. Or who focus on building security products, and now need a web interface to them.
Basically, try to find companies who are technical, but are missing the skill your company can provide, and then provide that.
Basically, try to find companies who are technical, but are missing the skill your company can provide, and then provide that.