There aren't any samples (AFAIK) that do exactly what you describe.
If you really want an accelerometer/labyrinth game, there's a C++ sample at http://code.msdn.microsoft.com/wpapps/Marble-Maze-sample-for-c9f3706b
Alternatively, there a lot of other samples to learn from.
These should keep you busy for a while: http://code.msdn.microsoft.com/wpapps/