AITA for replacing our living-room curtains without asking my roommate because I paid for them?

My roommate stopped in the doorway and said, "Why is the whole room yellow?"

I'd replaced the dark blue living-room curtains with an ochre pair. I liked how they looked with our wooden furniture. The old ones were clean and usable, and I'd folded them into a box rather than thrown them away.

When we moved in, we chose the blue curtains together and split the cost. They were the compromise between my wanting something bright and her wanting the room to feel calm. Over the last few months I'd said I was tired of them. She always answered that she still liked them.

I saw the ochre pair on sale for $46 and bought them with my own money. While she was on a long shift, I hung them up. I thought paying for the change and keeping the originals meant I wasn't imposing a cost on her.

She says the cost is sitting in a shared room she now dislikes, and that my purchase didn't make it my room to decorate. I replied that she could pay for the next pair if she wanted another change.

That made her angrier. She says the original compromise was still in place, not an auction either of us could outbid.

I offered to swap them back for a week so we could compare, but she doesn't want a trial she never agreed to start. AITA for changing them?