Very happy to report that the backgrounds for all my sunflower blocks are stitched down! They still need a final trim before making the flying geese sashings, but that will have to wait for February. Here is what they look like now, all together on the design wall (and taped to the adjacent wall).
After trying a number of layouts, I think this may be the final location for the blocks relative to each other. There are a couple of outliers that I dithered about whether to remove the first backgrounds and substitute something else, but in the end decided that would be way more work than it's worth, especially since the blocks will be separated by sashings. I'm hoping to make the entire quilt from stash and my scrap tubs and trying to achieve an overall scrappy look similar to the featured quilt in 19th Century Patchwork Divas' Treasury of Quilts, shown below.
A quick look at the individual blocks while they were still up on the design wall and away from the kitty's ever-exploring paws. Had to hold the camera at an angle and attempt to get them more or less level. As you will no doubt see, several of the backgrounds required piecing in order to cut a 14-1/2 inch square.