How to use a screenshot as a background image for a certain view.

titanium.screenshotbackground.js

  var screenshot = win.toImage(); // make sure to change 'win' to whatever your window/view is called
  var file = Ti.Filesystem.createTempFile(Ti.Filesystem.resourcesDirectory); // create a temporary file
  file.write(screenshot); // write the 'screenshot' to that file.

  var w = Ti.UI.createWindow({
    backgroundImage:file.nativePath // use the native path of the temp file
  });