You can also use MS paint! Just "Stretch/Skew" it from original horizontal and vertical down to %5(more or less depending on how large the picture is) for each, then resize it to %500 then %500 again(same thing as before, it depends on how big it started and how small it shrunk). It wont be the same size as the orginal pic but thats not important.
That picture took less than a minute to do, if I tried I probably could have nearly replicated Wookies by messing with the values.
Everyone says "Well maybe i'll make a difference",
Thinking they've got plenty of time
But you're squeezed a little tighter everyday
Finished before you can commit a crime