Obviously, i wouldn't just change the phone's colour just for shits and giggles.
I'm on my 3rd iphone, the last one I paid $200 to apple for a replacement. This time when the screen cracked (on carpet) I just wanted to get the screen done. Found a place, just the front was $80. Spotted the yellow front and back for $120. Feel better?
Won't be covering the phone with a case as such, just a bumper that recesses the screen.