I thought of a couple other things. Allowing the wash to dry to various different points, prior to blotting with paper towels, will also change the level of the wash. So, lets say you wash a section. Wait a little bit, then just blot some of it, in random places. Wait longer, blot some more random places. Again, you can (should?) always go back and add another layer or layers. The key to the "natural" look is to NOT create patterns. Always random. Personally, I find it easiest to plug into my MP3 player and actually not pay attention, while paying attention (OK, that makes sense in my head; hopefully yours, as well), and constantly squinting to get a better feel of the overall look. Make sense?