Showing off a bit of synchronicity between my digital and analog hobbies: I have used Blender to model and plan out my garden. From this screenshot you can have a better understanding of its layout. I just completed the eastern side on the right of the picture. I put in a little curve on the separation between the red rubber mulch pathway and the bed of decorative rock to account for the rounded edge of the big bed (and to keep things from being all right angles, I guess).