flashing light, diantus deltoids, aka maiden pinks.
alas, it was just too hard to keep going after a few years the grasses invaded so much and the flowers didn't do as well as at first. each flower has a lot of tiny seeds so it was easy to take one plant and then ramp up to fill in that whole garden. but the time spent weeding it was too much and i wanted to do other things in there.
if i'm going to weed a place i like some fruits/veggies from it too... not just flowers, but flowers are also nice.