Technically speaking, doodling is drawing that is done while your mind is otherwise occupied… a kind of absent-minded sketching that has no particular plan or expected result. When we talk of doodling in papercraft however, we’re generally referring to the addition of pen work that has a decorative effect.
Doodling is a great way to extend the use of stamped or printed images. You can add certain elements to a picture to make it suitable for occasions for which it wasn’t originally designed. For instance, in the image below, simple cat pictures were adorned with doodled elements that have a Christmas theme, making them usable on holiday cards and layouts. You can also doodle borders [TUTORIAL], embellish sentiments or even design your own little characters with a few strokes of the pen.