In the photo art and photo aesthetics medium, there is a type of art called photographic mosaics, or photomosaics. As the name suggests, photographic mosaics are a photograph which is tiled as a mosaic from other photographs. However, photographic mosaics are traditionally tiled in a uniform rectangular grid. This project explores the possibility of a novel method of creating irregular rectangular tiled photomosaics, by using treemap layouts as the basis of the tiling scheme. We find that aesthetically pleasing and superior results can be produced through the use of descending sorted Spiral treemaps and unsorted Split treemaps, using uniformly random values.