How do you advertise a commodity?

While creating difference among razors is becoming difficult as manufacturers go from three to four to five blades and beyond, when it comes to commidities like milk, eggs, and veggies the process of creating difference seems unlikely. The "Got Milk" campaign doesn't brand milk, but rather encourages consumption of the category. There are brands of eggs, like Eggland's Best, but what about veggies? Is there a carrot with a difference? The creative folks at Crispen, Porter and Bogusky have come up with a campaign for Baby Carrots that is off the wall, attempting to align carrots with junk food. Novel idea. But I wonder if, beynd the commercial itself, there is anything in a carrot that will make someone turn away from their favorite chip or other snack food. Nevertheless, this is an interesting case study. I always think it's fun to develop creative ideas around products with no discernable differences. Take two quarters, for example. Do you think you could come up with a campaign that makes one 25 cent piece seem better than the other?