Depends on the style of property, to a large degree.
Certain new builds that have the right brick colour & maybe a bit of natural wood cladding can look good with green or grey accents.
Round are way there are a few people who seem to have jumped on the fashion band wagon without really considering the aesthetic of the whole house & have stuck grey window frames and composite door on a 1960’s red brick council semi and it just looks wrong.
A mate of mine had his white UPVC windows replaced with grey aluminium (much thinner, so larger glass area), put a grey composite door on with a matching style frosted glass panel down the side & had the cladding on the house re-done in cedar & the result is really good. It all goes together well & matches the style of the house, but if he’d have only done the windows & doors it wouldn’t have gone with the previous cladding.