Myself I've only seen colored three-slot coin phones in beige and olive green.
I can't recall ever seeing that many color three-slot coin phones. The ones that I saw were either beige or olive green. The touch-tone three-slotters had a brushed metal front panel surrounding the keypad. I never saw very many three-slot coin phones perhaps because touch-tone itself only started to come into common use in the early to mid-sixties and the at the time "new" fortress (big boxy style single slot) style payphones both in dial (Very often grey dial surround and grey handset with blue "strain relief" and an armored cable between the handset and the body of the fortress) and touch-tone models. With that in mind the life of three-slot touch tone models was likely limited.
Speaking of fortress style pay phones how many times have you seen a TV or movie that has someone using a fortress style pay phone and when the coins are inserted you hear a ding-ding?! When three-slotters were replaced by single-slot fortress phones there *never* was any external sound. At the outset when coins were inserted the operator could hear beep for a nickle or beep-beep for a dime or beep-beep-beep-beep-beep for a quarter which was on later models just a feed to the operator's console indicating how much had been inserted.
[TELECOM Digest Editor's Note: But occassionally even later on, an operator had to manually collect the money by listening to the beeps. The 5 and 8 keys (or maybe it was the 6 and 9 keys) when pressed together very rapidly once or twice or five times in a row gave the audible sound required to simulate a nickle, dime or quarter quite well. PAT]