Consider: by the time you purchase two decor items which really look amazing, you probably will spend more than what it takes to fill in the niches. Bonus, you don't have to get up there and clean.

Whatever you decide, please, do not add hanging phony plants.

What room(s)? Can you share a picture?

sorry, re-read your post.

I had bizarre arrow shaped niches in my powder room that drove me batty and I was scared to get a quote to eliminate them. It was cheaper than I expected and I am SO MUCH HAPPIER without them.

That said, pictures would help people figure out what to do if you really don't want to fill them.