Papa Bear spent some time working at a flooring store a few years ago, and was able to learn all kinds of neat tricks. One of them is how to build crazy transition pieces to put where 2 kinds of flooring meet. We needed just such a piece at the door of the one bathroom. This is what needed to be filled in:
Here's what it looked like once it was filled in:
In order to achieve this perfect transition and make it look so good, Papa Bear made this crazy piece from some hardwood scrap.