Summoner Rift Skins

Hey why arent there skins for the normal Summners Rift Map like in TfT? I think maps and minion Skins with runterra factons as theme would be very nice like a Demacia vs Noxus Rift or Piltover vs Zaun. I think the normal minions and map look kinda boring and this would make it more customisable.