One thing I usually do when I am adding a yoyo to the center I pick a spot on the original fabric that I think will go with the center of my Kaleidoscope. If you have a pretty busy K then you want a yoyo that will blend rather than contrast. But your K is not that busy so the contrast works really well. It gives it some interest to go with the K
They are very pretty! Sometimes I think some I havae made are too busy and that is why I don't like them. It is a balancing act! I made two out of some bird fabric and I don't know if I like them or not. I will post them when I have time. You can tell me what you think.