perhaps a multidirectional icon for shifting a tile left, right, up and down for a custom tile order as preferred.

Alternatively, keeping some stats on the frequency of app tile use and bumping those to the top would be interesting.

Although human preference for familiarity would tend more towards a static configuration where muscle memory always finds an app tile in the same place. ex mail app in the upper left.

This is now beginning to resemble the android/ios desktop experience and icon arrangement.