Plenty of choice I'd imagine! A classic shot would probably be best to go for vice modern one, purely on the grounds it could become more of a talking point. When I say classic I'm thinking pre-2006.
One other thing I neglected to mention previously was that Sainsburys in Hereford's cake machine breaks down regularly, meaning they can't do them. What I would therefore suggest is getting the cake done with some allowance for such delays. The cake will be in date for some time after (I think they're allox 3 weeks usually, but check the sticker on the box when you get it to be sure).
This time of year they're not usually busy doing 50 cakes a day, so you should be OK to get it swiftly. If the machine has broken on the day of purchase, you can apparently still purchase the base as is and return with your receipt and photo of choice the next day or whatever. I recommend following this course of action as I know the Hereford branch runs out very quickly. They can get a load of 12 in and they can be all gone the next day sometimes. Of course, if you do that double-check that they'll do it for you the next day or whatever though, in case they've changed their policy!
If you should so choose, you can add some text to it too, so you could have Happy Birthday or whatever on it if you wanted. Whatever you decide to have on it, they'll show you on the screen what it would look like before printing it.
As you might have guessed, we've done this sort of thing plenty of times before!