I'm sorry to be repeating myself with stuff I've posted elsewhere, but I made some wharf piles from 1/2" Meranti dowel which I can show you. This system might work for you.
Step one: Hold the dowel in a vise and use a draw knife to cut some splits into it.
Step two: Paint the dowel white.
Step three: Wash it with black until you get the look you want.
Here are some of the stages. I only used black and white.
Then Step 4: Paint the bottom of the pole black. (All paints are acrylic).
Step five: Use isopropyl alchohol to rub away the transition area where the pole will be buried in the ground.
I hope that this has given you some ideas, Al.
Cheers