Meh, Diana puts her sword down into the ground and has her hands up like she is recalling into the moon. Zyra is like digging into the Earth (she was a plant at first after all) while she recalls. Soraka is levitating into the sky (which stars are what we see in the sky!). I think there's more meaning behind at least most of their recalls than you think....that's just my opinion though! xD. I hope they get around to all Champions, even the ones like Ashe and Janna who got their visuals done already but were not given an animation to their recall eventually.