I use a piece of Hazel cut from the hedge
Likewise I make my own. My most interesting one is not wood though, it has the silver handle off a stick I bought from James Smiths umbrella emporium and the stick itself is made of a peice of the kind of steel tubing used for curtain and towel rails, which I have drilled and corked to turn into a flute. Very unique, and it has the honour of having been played in both the palace of Westminster and St James palace very recently all within a weeks space, not that I was invited to play it, I just did. In it's original format it nearly got me shot once being mistaken for a gun, but that is another story.
Thing is in making your own you have something that is unique, I need to use a stick for walking and the way I think is something you make for yourself is always going to be more interesting than anything off the shelf and often becomes a conversation piece as my flute stick certainly is, people just don't believe it, when you pick it up and play a tune on it as it is not what they were expecting.