Daylilies are very easy to care for and will keep coming up year after year. Plus, they are one of the flowers that can be split up and transplanted to wherever you would like.
Hostas are another plant that keeps coming back year after year and can be split when larger to transplant also. Hosta is also a great filler where you want more "green" in your flower beds.
Hostas will develop small white flowers to add to their beauty.