Abstract: This paper discusses the principles of traditional mosaics and describes a technique for implementing a digital mosaicing system. The goal of this work is to transform digital images into traditional mosaic-like renderings. We achieve this effect by recovering free-form feature curves from the image and laying rows of tiles along these curves. Composition rules are applied to merge these tiles into an intricate jigsaw that conforms to classical mosaic styles. Mosaic rendering offers the user flexibility over every aspect of this craft, including tile arrangement, shapes, and colors. The result is a system that makes this wonderful craft more flexible and widely accessible than previously possible.