Step 1: Get (or make) yourself a box that 14"(length) X 14" (width) X 6" (height)
* I say 6" because that's what I prefer. I've found that with misting on cards and layouts this distance allows for a more even spray (if I want splotches I move it closer, and if I want more shimmer than color I move it up higher than the 6").
Step 2: Lay your paper inside the box and spray or splatter away!
Very simple, easy, controlled mess--there is no clean up (you can just let the over-spray/splatter dry on your box) except to put your box away for the next project.
Now that you don't have an excuse to not give some misting and masking a try, here's some card inspiration to get you started...
Practical Scrapper Michelle