Kevin Walzer provides this before-and-after comparison: vs.
These shots were taken under MacOS X. Kevin writes: "[t]he differences are pretty clear: the Tile version picks up the pinstripe background, and also the entry widget looks native (without the outline that one sees in the standard Tk version). . . . I don't personally see a huge difference on Windows when Tile is used there (standard Tk looks pretty much like any other Win2K appp), but it's pretty dramatic on the Mac."