This picks up on your warmer colours in the cushions, and would lighten things up. I think it's fun that it echoes the lines of the flag, and I also think its natural-looking texture brings in some more warmth. It comes in a darker, cooler version called Indigo that you could also look at, but I'd go lighter.

https://www.crateandbarrel.com/curtis-flint-grey-geometric-rug/f69269

white rug would be nice too.

I would also consider white or cream-colored drapes and hanging larger pictures. The ones you have are also hung too high.

Yes, white could also work for a more dramatic look, and I also agree with Ingrid.

Thank you all. I was thinking about getting one with pattern, these are my top 3 favourites but I don't know how would it look with this coffee table. And thank you Ingrid for advice with pictures. My room is not really high so I kind of put the pictures not above my height, but in the same hight.

Thank you all for your advices. I directed my views into another directions, and found a two new choices.

I will also change the drapes into lighter ones, but I want them to be in the same tone as the rug

I like some gray and cream tones for your room. Shag rug! Some bold art...

flag - Polyvore · More Info

I agree that a cream rug would really warm the room up. I also think heavy drapes in a cream colour would look great. I like the last photo adjusted by Rita.

what are you guys using to adjust the pictures?

I use an old version of Microsoft Paint.

I use polyvore.