I wouldn't try to match WO to walnut either, but that's just me - and many others it seems. But to address your question about dyeing and staining WO, look at Jeff Jewitt's website under the Stickley Finish Guide. There are lots of variations on Jeff's approach and materials, but he outlines the basic process very well.

http://homesteadfinishingproducts.co...rces/articles/

John