I've seen quite a few where they used fingernail polish. I'm unsure how that will hold up over time. Also, contact paper or decoupage. Again - with moisture it might now be a long term solution.
Here are some great ideas: https://www.countryliving.com/diy-crafts/g4124/diy-pretty-flower-pot-ideas/
Would be helpful to ask in the form of a sentence. You can't paint them, glue on material, scraps of tile and grout them. Stripe them with paint, dribble paint on them spatter paint on them. Add metallic paint in rows by taping off each color. We aren't sure what you want to achieve and if they are indoor or outdoor.
Hi Veronica, Here are some great posts on painted flower pots. I have painted many and they hold up well outside. https://www.hometalk.com/search/all?filter=paint%20flower%20pots%20
Here's some creative ideas for you:
Lots of ideas
Hello I have used spray paints and acrylic paints and put a clear coat sealer on top. Fun project!
I chalk painted my flower pots and like the look: https://momhomeguide.com/white-washed-patio-pots/
I stencil my pots!
here is some info https://www.youtube.com/watch?v=t6QIqYbDMv4
you can also use stencils on them, you could use deco podge and add on wallpaper, scrapbook paper or even napkins
Here are some cute ideas: https://www.hometalk.com/8933087/how-to-upcycle-cheap-flower-pots?utm_source=pinterest&utm_medium=syndication&utm_campaign=sdn&utm_syndication_post=16745