I have a house full of popcorn ceilings. I've patched a few spots that had leaks previously. Any ideas for painting those spots to match the existing ceiling without having to paint it all? Thanks for any thoughts on this...

you can buy the "popcorn stuff" and mix it in the paint.

If you have a decent size piece of the ceiling/texture that came off, take it to a paint store like Sherwin Williams. Drop it off and give them time to custom match it. It takes time but will be a closer match than just using the scanners that all stores have.

Bigger better the sample you bring in, the closer the match they can do. At least a few square inches.