Will,
I can't answer your question with certaintee but I'll relay my recent experience. I did a practice tiger-wrap on a small diameter srap blank using green and black on the base wtyh a charcoal top layer. I was going for a camo type look. In the end I got a dark green underwrap with a loose looking overwrap and none of the effects I wanted from the tigerwrap.

My next attempt will be using base colors with more contrast and on a larger diameter blank so that the waves made by burnishing are broader.