I'd seen these on, I believe Pinterest and decided to make some of my own.
All you need is glue (I use a hot glue stick), the cardboard from a toilet paper roll or from paper towels, and scissors.
Cut the cardboard in whatever size you want and try to make them all the same size. Glue them together.
Mine are maybe 1/2 an inch thick. I glued 5 of them together to form the middle and worked out from there.
It's super simple and cute. You can paint them or just leave them as they are.
Mine are being left as they are.
I haven't gotten super creative with this yet, but I'm sure you could come up with some really cool, cheap designs for in your home (outside of the one I'm showing you)