Warping with mouse can be used to create strange or funny images from photos or drawings. The functionality is intuitive, but depending on the result you want, you need to be patient and be good with mouse.
In fact, a most common use of it for professional design is like a auxiliary tool for photo retouching. Many times it can't be use lonely for this task because it's able to remove some kinds of regions only marginally.
First you see the original part of a face and after a warped version of the same image. I created the example above with some dozens of individual warping operations using my mouse. The tool configuration used was deep in path and very restrict in neighborhood.
Would you like to try it to see how you would deal with this kind of tool?