I must be a minimalist or cheap, as I like the 911 without a frame. That said, I have a license plate frame on my F150, that has a row of LED lights at the top. They come on in reverse. Makes a huge difference in my truck when using the back up camera at night.
In the late 70s, my TR6 rear license plate frame said, No Fat Chicks. I got a lot of laughs, but one time in stop and go traffic, I had a carload of big girls behind me. They weren’t happy and they let me know I was number one! 😂
I took it off soon after and never used it again, because I was afraid somebody would keep my car, etc. but still have it, for the memories.