I'm really interested in interiors trends, but definitely don't lead the pack myself. I reckon to do that you must have a shitload of money, or be a passionate DIY-er, since most of us expect to repaint a wall only once every few years, if that. (Tell me I'm not wrong about that!)
Also, I live in a house with lots of little rooms, and lots of clutter. I love strong colour but I don't want to look like an explosion in a paint factory, either, so the spine of the house (the entrance, stairs, halls) are all a very pale grey, with a darker grey on the bannisters and doors and very little on the walls. Then each room is like a little jewel box opening off the pale. But because you can easily stand in the hall and see into four rooms, I've got quite a limited palette running through the house (basically grey-green-blue, with either mustard or burnt orange or pink accents). That makes it calmer, I reckon. It also makes it harder to make radical changes very often.
Basically, everything I love is at saturation point: dark blue kitchens, grey, grey with yellow, grey with pink, mid century modern, a touch of Orla Kiely.
I reckon pale pink will peak soon, and be replaced by darker, warmer pinks, peaches and terracottas. I'm definitely sitting terracotta out (I was there last time round) but I am just painting my bedroom a dusky rose pink, rather than blush, and accenting it with green - I reckon green has a way to go.
I think grey has had its day (though that's not going to stop me) and the new neutral might be brown - either dark chocolate brown like Abigal Aherne, or lighter taupes. I rather like taupe - so long as it's cool, not peachy - and there's only so many places you can go in pursuit of a neutral-that-goes-with-everything.
Mainly, though, I think the dark room thing and the muddy colours will be replaced by brighter, clearer colours - perhaps strong pastels used together, with mint green with sugar pink or baby blue. It will be colour blocked and contrasted to keep it grown up, but for me it's still too reminiscent of the 'white with a hint of tint' paints I used on my first flat, and I'll not be going there.
Last prediction: more hippy stuff. Hairy macramé, cork walls and floors, hanging baskets, chicken bricks [shudder].
When I left home 35 years ago, I decorated my room pale neutral, with lots of dark wood Victorian furniture and retro touches - and lots of green. I'm pretty much still doing that, though evolving round the edges to nod to trends. I expect most of us are the same.
Oh, and when I do something that's high fashion, I try not to invest in it. For example, my dd1 wanted rose gold accessories in her blue bedroom. I just bought a pot of Annie Sloane copper wax (costs about a fiver) and rubbed it onto her mirror frame, clock, desk and drawer handles etc. It worked a dream, and we didn't have to throw anything out.