TilePhotos is a very simple app that creates an array of sub-images of a given image, creating tiles from it.
The tiling of a given image is determined by specifying the number of row and column subdivisions. Record these values in the Preferences window of the application.
Drop a file (or folder of images) onto the application icon in the Finder, or its main window to tile it. You will be prompted for a destination for the generated tiles.
Each generated tile image will have a custom icon added to it, and it will be named after the original photo with the row and column index appended.