I'm working on a knife for my sister and I'm using fairly plain wood. A 2" piece of oak sandwiched with two pieces of mahogany. Seems pretty plain but will have some special meaning to her. I guess the term liner is incorrect because I'm looking for a red spacer material to put between the three pieces of wood. What would you suggest to classy up some pretty plain wood. Hope I didn't offend any oak/mahogany fans.