Opening Title Night Theme

On the opening screen when you first open Minecraft and you get all the options to play and such, I think it would be cool if the background gradually changed to night, as the day progressed. 

Example: If it is Midnight in real time, the background should reflect that. 

I know this isn't really necessary but it would be amazing to see it happen! 

Edit: It would also be nice to customize it so that we can choose a world to play in the background.