I like this designer:
www.meadowlyon.com.
This design would look lovely with those pinwheels. Or
this. You don't need a Iongarm to do pantos. Trace the pattern onto a roll of tracing paper or a water-soluble stabilizer, pin to the quilt, and baste it in place. I do e2e like that on my mid arm all the time. (Husband helped with only a couple of small quilts, tearing off tracing paper, before I told him about the water-soluble stuff. "Buy it!" he said.
) Pinbasting first in rows, then with water-soluble thread so I can pull the pins and quilt without worrying about them. For me, starting at one center edge and going all the way across seems to work out best, then working from that center row/column out to the ends. Bind it and toss it in the washing machine.
The disadvantage of water-soluble products is that they're very responsive to humidity or lack thereof. Too humid and they stretch and stick to your skin when you sweat. Too dry and they get brittle. Wet-nosed dogs are hazardous as well. My granddog was staying with us, wandered into my studio, and stuck her nose onto my quilt! Fortunately I'd already done that corner.