well, John's mention of 'distortion' programs reminded me of one I have. Originally in German, it now has an English interface.

It is called AnmanieSMP

and by creating an image of a piece of text (with a screen capture program) this is what I did with it. It would take lot of work with the various distortion features to get a real circle, or symmetrical shape, but if you just want to play, it is neat! (Before, I have used it mostly on pics of people, to create caricatures ....like Mona Lisa with a frown)