Despina (the Greek bearing gifts) had given me an old red cushion ages ago, before I weaned her down to recipes and pegs only. Ugly, but comfy. So I didn't have to buy a cushion insert., hurrah!
I went to Lincraft and got piece of green denim for a couple of dollars. It doesn't quite match, but it's only on the back anyway, so I can live with it. And all my cushions are different greens.
Then I tried to go back to Lincraft on Saturday to buy a zipper and some green thread and stuff, but it was closed down! I had to go to Tapestry Craft instead. There are not enough craft shops here, compared to Maitland.
So I finally had everything. I cut matching 17" squares from my green denim and my print, and sewed the zipper on the bottom of the print and one side of the square, then sewed the rest of the square together. Ta-da!