Just beside the parking lot at the Royal Botanical Gardens, I found this great swoosh of Carex comans (perhaps Frosted Curls? - alas no tag). To me it looks like a lovely doggie tail wagging between the little evergreens and bulbs.
For years we've been encouraged to plant in oval and round clumps - while this planting pattern might not work for upright daisies, I think it does for soft floppy plants that have lots of movement.
Next time when you're travelling on a highway, take a look at the patterns formed by the different varieties of wild flowers...and with those examples in your mind, think about how you might want to plant your next informal garden.