A method and computer program product to create an unlimited number of synthetic but realistic, biologically-based, 2-D images like irises and magnetic resonance images (MRIs), as well as other images is presented. New metrics for measuring the mathematical distance of such synthetic images from a source (original) image have also been proposed. These metrics and the synthesis procedure are applicable to the development of image retrieval systems. The presented method can be extended to synthetic images of non-biological origins too.