I think the biggest issue with the woodcut as an effect is the limitation of the challenge itself. This would be quite a bit easier if you were not limited to pure B/W since you could to some opacity tricks as well as other distortions to break up the pattern. Unless you hand draw all of the woodcut or make the pattern much larger, I don't think you will find anything that will break it up enough... And of course, the hand drawn part is much harder if you don't have a tablet....