it depends on what your plans are for the car.
if you plan to use the car as your typical accord owner would, then there is no reason to start putting money into minor cosmetic details such as that. It is a car designed to get you safely from point a to b. Nobody is ever going to walk up to an otherwise stock accord and be like "damn yo, nice color matched sides."
But if you want your car to look nice and have plans to build it up properly then by all means paint them. Unless you can afford a full lip kit, in which case i would say to leave the stock ones black anyways.