Patchwork Pattern Maker

I found this great site (through pinterest) that turns any picture into a pattern for a quilt, but I think it would also be a great place to make patterns for anything from a large scale mural project - where the mural is broken down into manageable chunks for everyone to work on, to mosaicking a drawing or showing how a real picture can become more impressionist.  I really think this has uses for every level of art education.