Check out this Patchwork Pattern Maker on the V & A website. It's really simple to use, all you do is upload your photo, select the area you want to make a patchwork of...
And, ta da! a patchwork. You can choose the number of colours and pattern complexity, although I found that the more complex patterns didn't work so well.
You get some good instructions on how to put it all together too.
I wonder if anyone has used this to make an actual quilt? It's fun though, not least of all because you can make patchworks of random objects around the house, your kettle, back door, favourite armchair, and of course, your cat.
My cat's face, perfect for a quilt.