Special Field Backgrounds

I know that most of the fields are based on type, but I've noticed a lot of people like to put their legendaries or shinies or whatever in one field, and I thought it might be cool to have more field backgrounds like the ones in the games. For example in ORAS there were a few box backgrounds that were exclusive to that game, and same with some of the other games. Basically fields with backgrounds that are exclusively aesthetic in nature?