Beautiful curved raised bed garden using Landscape "Stones." You can buy these cut to allow you to make curves at both Home Depot & Lowes.
How to build a retaining wall flower bed.
025 Retaining Wall
Love the clean look of this and it's not so elaborate that I couldn't do it in my own backyard
Front Yard Retaining Wall ~ DIY Newlyweds: DIY Home Decorating Ideas & Projects
SUBURBAN Spunk*: Our DIY Retaining Wall
My house started out similar (as the one shown here) with the massive bushes we removed, & this wall is a fab DIY project that would look great in place of those bushes ~ YAY!!
Kids' mud pit- or raised flower bed area. Benches would be easy DIY too
Raised flower bed