Whatever colour for the calipers you like Swampy
Any is far better than the colour of dirty brown rust at the end of the day
And more importantly, it's your car and your taste
Warning...Related Rant start
It really boils my pee when I see threads of people wanting advice on painting calipers and all they get from many members is slated for being "Chavy" when even merely mentioning the words "red or yellow" and they all jump on the bandwagon
Yet many of these very same people who slate others for painting their calipers in bright colours have the audacity to consider, wish for and approve of fitting Brembo calipers and disc upgrades which are of course, "bloody bright red"
Paint the buggers black or silver then once fitted if they so dislike "chaved up" calipers then, but how many actually do?
I honestly didn't realize that so many members are actually what is known as "badge/label wan**rs"
They forget that you can look through all their posts to see contradictions left, right an centre... Rant over
Anyway, have you considered metallic colours?... Copper is a good one to go with silver and dark coloured cars and at least hides/ matches the copper slip on the pad backing so an added bonus