Grey is the trend.
Imho it is cold, it absorbs the normal daylight spectrum hues in light, so always looks darker than the rest of the room and a bit gloomy. Imho It belongs to the “urban” trend of exposed pipes, bricks and public toilet shaped tiles. It is imho the equivalent of that bachelor pad craze for chrome and black.
i have grey carpets installed by my vendors in all my rooms. If I could afford it I’d dump them now even though they’re good quality and newish. I detest them. I am a bit of a clean freak so they always look dirty to me - grey is the colour of dirty carpets 😞
up until this house, we’ve used a pale “honey” or pale “ oak” colour . No it’s not trendy. But it is warm, it is a clean colour and reflects the warm “yellow” hues needed to make a house seem bright and light. I think that colour, like oak wood furniture, goes with a lot of decor colour schemes but you need to think about this. It won’t work if you want to paint your house in purples or oranges for example.
look at colour theory and a colour wheel. Think about your basic decor - not feature walls …but the basic colour you’ll live with for next 10 years or more. Pick a complimentary shade to that, make it a very pale shade and it should work. Grey does work with some schemes - but it does depend a lot on the “grey”. Grey is simply a “tone” of any other primary colour ..so you can have blue greys, yellow greys, red greys and that in turn can produce greys of any hue. So if you go for grey you need to know exactly what tone it is and will that work with your basic decor scheme tones. For instance the blue greys will always be more cold in perception, green and brown greys can look dirty, yellow can look sickly. So choose greys with a great deal of care.
But carpets should last for 20 plus years and you need something you can live with that does not depend on trends or what your wall colours are. A bit like a sofa- unless you’ve got money to waste go for sofa covers that are neutral and not dependant on a trendy decor scheme- something that will work whatever your scheme . Same with carpets. You can buy a cheap rug or 2 to add the zing of freshness of a new decor scheme.