My opinion is: Go with your creative side. I just read a pattern that said to always start with the border and then work with a pattern and colors to set it off. Ooops, that's not what I do so whatever I think may be going down the twisted path....but it's my path. I think the center of your quilt is marvelous. The 4th pic is conservative, beautiful, formal.
From my own experience go with your own creativity. If you want to do patchwork around it, maybe look at different designs or colors.