This video by Tim Holtz demonstrates the use of masks with inks for paper crafts, but these masks would be perfect for paint applications as well.
Using masks in this way is often referred to as reverse stenciling or negative stenciling.
You can find Tim Holtz Idea-ology Masks online at eBay, or Amazon.com
What a wonderful step-by-step demonstration clip! Easy to follow. I guess I should buy some of their products to embellish my gift wrapping paper.
Wow, these are great! Of course, I am thinking furniture and walls! Oh, the possibilities… Will check out Tim’s website.