A round cushion

Some time ago, we were visiting friends and I admired a crocheted cushion on their sofa. Our friend had made it herself many years ago - so long ago that she could no longer remember how it was constructed. I searched Ravelry for something similar and came up with one described as a "pinwheel pillow" - it wasn't the same design as my friend's, but a similar idea was used, so I determined to have a go at it... got the crochet work done, then bought a secondhand round cushion to use as stuffing... and then forgot it for a while. Today I have finally got around to making a new inner (from the stuffing of the secondhand one and using some leftover curtain lining fabric) and adding a couple of buttons from my stash - so another UFO becomes a FO: