Replaced the smallest container in that photo with a still-small-but-a-little-larger one, which now contains seeds for skinny onions. Planted cucumbers in the big one. Carrots and radishes in the other two.
Starting to think about the idea of getting pregrown flowers, but it's still a new idea for me. Right now I'm trying to figure out where to put more dwarf sunflower seeds, since the packet we bought online contained a thousand and so far I've only planted less than ten.