I have resprayed an old Holdsworth frame in gloss black, with a barber's pole in a metallic Mauve colour and old English white. The head tube is also in the Mauve colour and the head lugs are picked out in the white. To me it looks pretty good, and it will be easy to touch up if I get chips in the black or the white. The frame won't ever look dull because it has chrome ends (and fortunately the chrome is in good condition).
The other way you can give the frame a 'lift' away from a base colour that isn't fancy enough is to let in panel(s) in a contrasting colour; for example I did think about letting in panels in the white colour, just large enough to work as backings for the main transfers.
BTW this paint job smacks of being 'traditional' in a subtle way; in times past (and to some extent this is true to this day) the metallic colours are difficult and expensive to work with, so might only be used to give a lift/contrast to a paint job that is mainly in the (cheaper, easier to apply, easier to live with) flat colours used elsewhere.
The flat/main colours need to be chosen so that they don't clash/blend overly with the colours in the decals/badges and those you might use for accessories. So for example if you like white bar tape, a white barber's pole and/or a white head tube might set everything off nicely. Similarly if you use a Honey coloured saddle, not every frame colour might work with that. Think about mudguards, think about your favourite tyres; if they are coloured (or could be).
I have seen barber's poles applied in two contrasting metallic colours, on top of a frame that is in a third bright metallic or pearlescent paint. Very eye catching for sure, but maybe one is best off sat on a bike like that, so that one's gaze might be averted elsewhere....
FWIW if you want to give the bike a funky modern twist, you could make one colour in the barber's pole a 'flip-flop' paint; this is in a way in the spirit of times past, in that this is an expensive paint, difficult to work with.
Apologies if this is your bike but this
is (IMHO) an example of a bike where the frame would have perhaps looked OK by itself but the net result lacks cohesion. Not everyone will agree what is 'good' but just imagine what it would have looked like with white instead of the goldy colour in the frame, white head tube (or head lugs) white bar tape and white-walled tyres; my points are really that it is the whole bike you need to be thinking of, and also that tiny changes can make a big difference.
edit; this looks better to me
and a honey-clooured saddle would probably go even better than the white one, a bit like this
even the tyre sidewall colour is an improvement
cheers