DJane, Your quilt is beautiful. To grow your quilt you might look for ideas from Medallion quilt patterns. A starter idea is one from EQ8. If your center star was the center block, then purple
dot fabric, then block border around center square, then you can keep building borders either pieced or just Kaffe fabrics to make it bigger. This other screenshot I saw on line
I think if you put another dot border outside your Kaffe blocks, then added sawtooth stars in a double row with the plain block fabric being Kaffe, that would look really good to and finish with another dot border. Just some ideas to get your creative juices flowing. HelenW