Is having one different coloured wall is old fashioned?

I am a fan of this too.

Plain subtle toned single colour walls and then use some art, ornaments or paintings to add the colour. It's also really easy to switch around and improve.

Only problem is the art costs more than probably painting the damn walls would.

But the positive thing is it is a neutral colour so if you wish to sell it will not be anything someone finds offensive.

Oh god really? Well I’m not repainting it again. Maybe it’ll be back in fashion soon.

This!

My place is trade magnolia unless someone fussy comes round and then its Lightened Autumnal Wheat.

It seems to get approving nods.

I find the feature wall where someone does one wall in stripy agressive wallpaper and the rest in pastels a bit much. I tend to see these in greige places along with giant clocks and words spelling out commands and nouns like "EAT" "BATH" "HOME".

I have the inset walls behind the shelves either side of my chimney breast painted, not the chimney breast itself. I think it looks great and adds extra depth.
I think it’s now a classic - I would not wallpaper big flowers though - that is so dated and was never a good look in my opinion.
@Joeninetyi think bare broncos are great too - in fact I clad my extension (done before I bought it) with brick slips and it’s added so much warmth and character to that space!

I agree with the thought that you should do what you like, but yes feature walls are very outdated. Colour drenching is the thing atm but that doesn’t mean you have to like it.

Example

Example

Example

I keep seeing pictures of people having colour but not restricted to a wall, to highlight an area of a room in a modern way

It's a great way to get some colour/interest into a room without it being everywhere!
I've got several rooms with a feature wall and I love the look. I think I go for classic/stylish rather than the latest fad....... I also love colour and have it in most rooms!!
If the white is too clinical fine a pale colour/cream to add warmth to your rooms.
Have a look at some catalogues ie country living for ideas as to how to put a room together. Probably some suggestions on things like Pinterest as well!!
Going by Dulux website, many of their paint choices are 'feature wall' - gorgeous colours but too dark/dominant for a whole room.

If it's north facing, I would use a warm pastel or neutral like Little Greene Linnet or Earthborn Ballet Shoe. If you want to do something that's more 'in', paint the ceiling and skirting boards the same colour (colour drenching) or do something like @slowraindrop suggested and have tonal contrast with a darker shade of the same colour on the ceiling than the walls. The paint manufacturers have inspiration pages that would give you... inspiration!

White is a strong colour in a way and most feature walls would be a harsh contrast so maybe rethink the whole scheme. I have a feature wall where I've just used a deeper shade of the same colour on the other walls and it accentuates the chimney breast. I agree it doesn't matter what's in if you like it unless you're so out of date people wince when they visit.

No amount of white paint or pastels will make a dark north facing room light and bright. It is what it is! Lean into the darkness with the paint choices. Go dark and moody and definitely on all fours walls. If trendiness is a factor then colour drench and paint the ceiling too.

Even people that live a conservation area are allowed to choose whatever coloured walls they like!

Go for it OP, how much is a tin of paint? No worries to go over it when you change your mind down the line.

“On trend” is one of my least favourite phrases in the English language.

Yes but this is a textural wall in tonal colours. Furniture and curtains alongside create a whole vibe. Not a painted wall in a different colour to the rest of the white walls. Totally different.

Exactly this.

Those colours look great but I think one wall painted those colours in an otherwise white room will look odd. The pictures you have posted are rooms with a while vibe. Painting one wall that colour won’t give the vibe.

It’s not quite the same but I have rooms that flow into each other due to opening up the layout so there wasn’t an obviously place to change paint colours and I wanted to use paint to delineate rooms so I’ve ended up with one wall painted matching the room it leads into. Very long story short it looks really nice and I don’t think it looks dated. My pretty bang on trend friends, far better than me at this stuff, all love it.

I re decorated last week.

Living room.

I have a jelly bean orange wall,
a yam wall, and 2 yellow walls, with a jelly bean orange strip all the way around the yellow walls, and a yellow strip through the jelly bean wall, no strip though the yam wall.
Sounds awful looks amazing.

Bathroom.
Dark peach with a jellybean orange wall.

Kitchen.
Light peach.

My bedroom.
Jellybean orange wall, and thereast is peach with a jellybean strip around it.

All way is yam.

All above Sounds awful odd and maybe old and dated.
But I love it, it's different, it has life and colours.
I lived with the grey and whites for 2 year and tbh it's just not in now.
Bring back the funk and the colour.

One wall in the living room, not necessarily but one on trend wall isn’t going to stop the rest of your house looking dated. I said painting and redecorating to keep up with trends. Changing worktops, cupboard doors, flooring, lighting, decor and repainting will cost a fortune. Trends move quickly and OP has since asked about panelling, which is also dated. The point is not to do something because it’s trendy because your house at some point will always look dated unless you spend a lot of time and money keeping it looking on trend.

And The Berkeley and London. Complete with massive feature walls

This. 'Design' and 'Trends' are just someone else's opinion. In your own house the only opinion that matters is yours. My lounge feature wall is wallpaper, and it's beige. But I like it so I don't care what anyone else thinks.

I really wouldn’t take any notice of what is ‘on trend’ when it comes to interior design. Whatever designers are telling you to buy now, they’ll tell you is ugly and dated by the time you’ve got it all done. Their only goal is to keep you spending £££. Don’t be a fool. Just choose what is appealing to you.