Spotted on Primo's car yesterday morning: frost feathers!
Maybe the effect was so visible because the car is black?
The roof swirls were especially cool but I had trouble getting high enough on my tiptoes to capture it. Since I was still in my bathrobe and the middle school bus was on its way, I decided that discretion was the better part of valor, or at least my fifth grader's ever-lasting embarrassment, and didn't go get a stool.
There's a knitting pattern in here somewhere!