I've been using Backdrop for years, so I was eternally grateful to see it on the Mac App Store, still at the low cost of free. While it hasn't added any bells and whistles (I don't recall the "pixel test" before, but perhaps because I didn't use it) the app does one thing brilliantly: it places a backdrop over your desktop for taking screenshots, doing demos, etc. That's it! You can customize the backdrop color, add an image, or have it float on top of your desktop clutter (my preference) or under it, obscuring only your wallpaper (that pic of nyan cat won't be the butt of boardroom jokes anymore!).
Backdrop is a
