When Grancey and I lived in Iowa, we were treated to a weather phenomenon that still leaves us breathless - hoar frost. I looked, but this is the best picture I could find (in Oregon). It's not exactly what I had in mind, but sorta.....
It is neither an air frost nor a ground frost, and is extra cool when a foggy evening suddenly drops below freezing and the fog freezes and crystalizes in place with whatever it's touching that morning. It is the non-Southern version of Spanish Moss, because the trees are appear hairy and GORGEOUS. It's really something to see a whole field of trees covered in this stuff.