Gorilla Marketing

We are a law firm that is trying to run an extensive Gorilla Marketing campaign. We want to extensively target 1-3 local cities, and completely saturate the market with very creative strategies (not the run of the mill Billboards/ Benches/ SEO). We want to be on the street, where people would see us a number of times while travelling in the respective cities. Looking for someone with extensive experience in this type of marketing. Even if you are not local, we require someone that can manage the project remotely. We want very creative ways to market and target our audience, and want someone that we can work with for the long haul, as this won't be a one time campaign. Please send me your most creative ideas and/or plans of action.