I have a pattern in the form of a mundane rectangular image. What I want to do is transform the image so that it looks like this rectangular pattern is a ribbon that was twisted around to form something resembling an infinity symbol (or a figure-8 if you like). How would I go about doing that? Is that a simple enough job? The s/w I have to work with isn't very much, but I could make use of the ubiquitous Photoshop.