This is a nifty online (and free) application. I recently used it for an awards show image where the first photo of the recipient was a mosaic and then the ‘real’ photo faded in to reveal who won the award. I did this sample of my daughter for the blog.
Here is a close-up that shows how the original image is converted to 1,000s of images that recreate the photo as a mosaic.
Give it a try at the “Image Mosaic Generator” here.
– Troy @ TLC