Beginner Gardening: Need suggestions for my front yard, 1 by EmmyC

EmmyC wrote:
About 8 years ago, the City removed the trees that stood inside the circles. It's way past the time when I should have done something to improve my curb appeal, but I kept putting it off. I'm in zone 6, so whatever is done has to look OK in the winter. Also, I'm not good at gardening and don't want something that needs a lot of care. Does anyone have any idea's? I have 3 pic's to post to give an idea of how large the area is.