How about a part from the car? Long ago, back when events were meets and not shows, Mr. Shelby was doing signatures for free. There was a long line of people waiting. They had all kinds of media from plain white paper to skin. A Cobra owner wanted to get something signed but he had nothing at hand to get signed. I suggested that he go across the street and buy a marker pen, go remove the air cleaner top from his engine, and get in line with it.
My friend did just that. Mr. Shelby was sort of taken back by the idea of signing a car part but he did it. In minutes people were showing up in line with markers and sun visors or glove box doors from their cars at the event.