I've loved the tutorial posted by Robin Perfetti in her blog, she gave us plenty of inspiration! I played as a kid! I've played for hours with the app she talks about, then I've looked for others, similar apps.
I've found another one that is called Kaleider Free (by Whizical), and it works transforming pictures. I've started with one doodle drawn with the Kaleidoscope application suggested by Robin, the one showed in the previous post, then I've saved it as an image and loaded it in the Kaleider app. It lets you play with many different kaleido effects and, after one hour - yes, you got it: over one hour! - I obtained 25 acceptable screenshots. I selected only 5 among that, because I think they are the most "tat-able". You should choose one and adopt it. Eventually, let me know if it will even become a real tatting.
Are you inspired?