For this example, the Liquib Mosaic Tool was applied to a photo of colorful street chalk in a partitioned container.  The Tile Shape was set to Hexagonal, with Averaged Colors selected for the Tile Content.  In this case, the Add Texturing option was set, causing the tiles appear slightly grainy and rough.  Tile Size was adjusted to 28 and Shape Regularity % set to 11%.  Because of the low Shape Regularity %, the tiles don't much resemble ideal hexagons, but have instead been distorted to better fit the image features.  Setting a smaller Tile Size would allow even more leeway in matching the tiles with picture shapes.  (Also see the image below.)

This Mosaic Tool variation used the same source image, with the same parameter settings, except the Tile Content was changed to Grayed Image Colors and Add Texturing was turned off.  The actual source image is shown, but with the colors grayed and slightly blurred.