Actually, we've got prototypes of the same bulbs that can do any color, that's controlled by a small remote. The form factor means we can only get 3 surface mount LED's on the PCB, so the 'white' is actually RGB, and as a consequence, not quite as bright as the straight white bulbs (but still significantly brighter than the OEM bulbs). I've not pulled the trigger on them yet as I don't care for the remote, but we've not been able to find anything better, and again, the small form-factor means we cannot use an app-based controller. You can see one of the RGB bulbs in this
old photo where I was showing how to remove the trunk bulb. Having interchangeable lenses (our red bulbs still use a white LED), on reflection, would have been a good idea, but as we wanted to completely replicate the OEM design, that wasn't a consideration, and actually removing the lenses is not easy.