It appears that you have a footboard on the bed, so I think side borders only would be just fine. As to fabric choices, perhaps black if that is the color of the buttons on your headboard or possibly one of the other solid colors within your headboard if you are keeping that fabric??? But yes, I would go with a solid. There are so many other beautiful prints - large & small within your quilt, I think they would stand out better with a solid border.