Hi Ann, here's one for fall made from a placemat: https://www.hometalk.com/32184167/diy-placemat-garden-flag
And even more!
I think your most important thing is to know the size holder you're working with.
I made one out of a leftover piece of corrugated tin. I am not much of a decorative painter, so it involved masking tape and spray paint. The frame was salvaged wood. Could be put an a post/posts.