How can one re-use empty plastic flower pots?

All you can do is try the spray paint made for plastic like Rustoleum brand. I usually just recycle the thin black ones.

I've done that with some success. I say some because it's only been about 1 1/2 years so I'm not sure how long it will last.

What I did was used a decent primer first, then painted over that. Mostly I used Rustoleum spray paints, but be sure they are ok to use on plastic. Quite a few paints will not adhere to certain types of plastic, so label reading is an absolute must! Every paint I've ever seen also has a phone or other contact to call for answers to questions like that. Use them!

Most any exterior paint should work, but I always have Rustoleum cans of various colors on hand so I tried that first and so far, so good. If you can't get that, use a quality exterior paint or an outdoor acrylic or alkyd paint in the color you want. The primer is the determining factor though. I found out the hard way that NOTHING sticks to plastic unless it's primed. And same goes for that --make sure it's ok for plastic.

You mentioned you weren't sure if they were plastic or resin. You might want to find out the difference, if any, and again, a call to the manufacturer never hurts.

Good luck! And have a great day!

You could take for flower pots of the small two larger and paint them and then you can make a lighthouse with them we turn them upside down paint the door on the bottom and light up top

In the garage for organizing like items together.

I would highly recommend RustOleum spray paint. Clean, scuff the current finish, wipe with denatured alcohol, then spray paint.