Mask with blemishes
Julie's little doodle masks are very cute but their utility is limited. The plastic areas of the mask as so thin that it's all to easy to get whatever media you use underneath. Worse yet the mask is so small your fingers can get in the way of the design as you work. SO WHY 4 STARS?! I found that Distress ink pads with the blending tool, as well as Pan Pastels, get some cool results. These work because they are not really wet. They also allow control over lighter and darker areas. Best you can work your figures around the small mask without grotesque smearing and other ickiness. Of course you can keep the mask still for the whole coloring, but you can also move and flip it around on the paper for a much more atmospheric design.