I had to add a few extra blocks, but with a narrow bright border, then a wider paler border, that'll do. But then I was browsing in a bookshop, and saw these clever basket blocks.
The basket parts are cut from two squares, and then the handles are appliqués onto a narrow rectangle and sewn at the top! The fairies brought a set of matching red, black and grey fabrics, so I thought I'd use some of those and make a sophisticated Linus quilt for a teenager. Just need to appliqué more handles!