Any ideas for me? I'm looking for a super non-traditional baseboard!

Something approx. 1/2" x 6" high that is super simple and rustic, like a knotty pine that I can stain. I think I need a regular piece of lumbar that we can use as a baseboard. Any ideas of where to find something like this?? Rings End suggested using pine exterior siding but it's 1 inch think and will stick out of wall too much. Rings End won't cut it and we are working with a special loan program through our town and contractor won't cut it down either. Is there lumbar anywhere that comes 1/2x 6" or close to that size?