I've been experimenting with some vegetables as a temporary ground cover, and others as "focal points" planted into that expanse of plants. This year it's spinach and arugula underneath and broccoli and cauliflower spaced widely within.
Both spinach and arugula are excellent cut when only a few inches high and cauliflower, especially, need quite bit of space. I've been unwilling to give up that much of my garden for a single head of cauliflower but layering the two, and maybe planting beets for an underground tier, seems like it will work well.
Just getting started now, but I'll post results later.