How do uniforms display professionalism and bring happiness to patients?

I work in a hospital that recently went to a strict uniform policy--all registered nurses wear navy blue, cna's wear wine colored scrubs, respiratory therapy is green, lab is gray, housekeeping is tan, etc. I definitely see the professionalism it demonstrates as patients are able to distinguish between different job titles. For instance, a patient puts on their call light and the cna answers it--the patient can tell by the color of their scrubs that they cannot give them the pain medication they need, so they can ask the cna to get the nurse. But on the contrary, when this hospital did not have a set color for uniforms, everyone could wear their scooby-doo scrubs or their smiley face scrubs. To me, I have been told by patients that these bright and colorful designs on the srubs bring them cheer and happiness, as they are already in a not-so-good situation being in the hospital, the scrubs add a sort of "light" to them.

How can we, as nurses, maintain a professional appearance, and still bring cheer and happiness to those patients who are intimidated by being in the hospital when a strict uniform policy is in place?