We've seen frost flowers, which I do want to try to make in my freezer (since I live in a place far too warm and dry to ever get frost flowers naturally). But I'm afraid that ice feathers, or rime ice, are not as easily doable. You can see them building up on the side of water, rocks, or branches, or you can see them in this post.
Kinja is in read-only mode. We are working to restore service.