Great idea and outcome!
I do a similar thing quite often. I use cheap pine boards (the knotty ones look extra good in my opinion), give them a light coat of latex paint, let that dry, then sand it off a bit to "roughen" it up. Then stain it. Going to have to try adding the sawz all to the process to see how that looks!
The white one has a light stain and the grey one has a darker stain.