I think our question is pretty explicit as to what we want to do, but I'll re-word. Want to use an existing photo, drawing, or create a drawing. Convert that to a mosaic grid pattern, manipulate it to change colors and pattern. Each mosaic design will be a pattern for actual mosaic tiles to be installed in the home (i.e. floors, walls, etc.). There's a Windows program called TILE CREATOR that will accomplish this, but prefer to use my MAC and a program created specifically for it. Is there such a thing?