I bought heavy felt from JoAnns on sale for $2.99. You'll also need a foam wreath form in the size of your choice; I did 12" and you'll need some dress pins.
Basically, you cut the felt into 3 inch rounds and fold it twice. Once in half and then in half again. Stick a pin in the bottom so you connect all 4 layers and then stick the pin into the foam. It's a lot of cutting of circles, but it's rather meditative. I like the orange because it can go for fall and then transition into Halloween with a spider and then transition into Thanksgiving with a turkey. I will also make a green one for Christmas and St. Patrick's!
I also would like to try and make one of of dyed coffee filters or cupcake liners or newspaper or magazine... So many options!
Finished product