My apologies for veering off the photo mosaic path here, but I just had to share this. I discovered artist Alexey Steshak through his own submission on Bored Panda where he documented the creation of a stunningly simple mosaic. Using everyday ceramic tile, he hand-cuts each piece of tile to suit his source image. As you can see in the photos, he simply sketches his source idea, then adheres the tiles directly to the wall.