Purple is my favourite colour, and I love crazy quilts. It would be simple to make your own pattern, Use a stack of fat 1/4s, as many as you can cut with a rotary cutter, and just cut pieces off starting from the corners, work around towards the middle. Change the top fabric to the bottom so you have a different one on the top of each pile, then sew the pieces back together, and trim all blocks to the same size.
Very pretty