Pixelize will use many scaled down images to try to duplicate, as closely as possible, another image.
Pixelize works by splitting up the image you want rendered (or duplicated) into a grid of small rectangular areas. Each area is analyzed, and replaced with an image chosen from a large database of images. Pixelize tries to pick images that best match each area. Pixelize works best when it can choose images from a very large database of images. With about 1000 images, Pixelize can do a reasonable job.