I can’t say I’ve ever seen a cream trimphone.
I was very small at the time we got a telephone, but I'm pretty sure my mother was swooning over the pre-BT phone catalogue which had a choice standard rotary phones and the trimphone variant. Or, if you were of significant means (which we were definitely not) the one with buttons. All in cream or grey. I think the reality was you either ordered (a) the grey rotary phone or (b) a long disappointing wait.
Of course, when we got the phone, no one was allowed to use it, on the grounds it was 'too expensive.' I don't think it actually rang for a decade and we had to consult the manual when it finally did happen.