But, having been impressed and amused by other people's icons, I'm starting to make some of my own, so here's one I'm going to use for SF (whether my own writing or talking about books/films/TV shows).
The picture isn't as good as it could be. I couldn't take the photo square on because the sun was right behind the sign. If I ever pass that way later in the day, I'll stop and re-do it. That's assuming it remains there for much longer. On Googling to find a web page for the Dr Who Experience, I've just discovered that the exhibition closed last summer. So don't all rush there to see it or you'll be sadly disappointed.