I think the potential for loading screens is quite awesome.

For people who would like a simple loading screen, I think Wyk's would be ideal. However, I know a lot of people LOVE kunkka's artwork, and therefore would love his loading screens with a loading bar (just like DotA 1). This is why I think you should be allowed to customize your loading screen. Obviously, this can afford to be implemented later as it's strictly for visual purposes.