Well, if there's anything very specific to a show you can try including it in the background (like the NYC skyline in
SaTC), or on the front (like the Tardis on
Doctor Who) but usually the background is less prominent on a tv show graphic as the characters often fill most of the space. You're of course welcome to use any elements from the show on the background if you find they work and blend well with the rest of the graphic
A thing that was already probably mentioned but is worth saying again is that very rarely do we use a group shot of a tv show, but try to use individual photos of the cast instead. Using a group shot as it is is usually only a last resort if a show has very little usable material/ everything is very low quality.