Recycling last year's Black History Month stock photography to save a buck: that's the Wal-Mart way. Come on, evil corporations. Fake diversity is 'Wack, Yo,' as minorities say:
Do not use the same meager handful of non-white employees over and over for photo ops: People notice this after a while. Specifically, your non-white employees.
Do not act like the boss on The Office: Simply watch each season of that show in full, and see how he treats the subject of diversity, and then do not do that. Surprising how realistic that show is.
Do not claim that your staff made up entirely of upper class Ivy Leaguers is 'diverse': It is not, we don't care what it looks like on the outside.
Do not claim that your company is 'diverse' because you hired minority-owned vendors: Hiring a 'diversity consultant' or an 'urban marketing firm' is not in and of itself a mark of diversity. Sucks right!!!
Hire a staff made up of many different types of people: Problem solved. (Though you may personally still be a jerk).