One of the more creative ideas I've had for advertising a law firm was to put a DUI law firm's phone number on bottle openers and either leave them on the counter at a liquor store or toss 'em into cases of beer at nearby stores. I never tried this -- it probably violates some ethical rule that I was too lazy to look up, but it seemed like a good idea in theory.
It's also a good idea, in theory for a law firm to mock a brewery's logo for advertising purposes: in this case, Sessions Law imitating Session Brewery. The best part is, the logo was not only used online, but it was also used on brown paper bag covers for beer cans, reports the ABA Journal. The brewery, unsurprisingly, is suing for trademark infringement.