This quilt is lovely. I am thinking that you could do whatever design you wish on it. An all over meandering would be nice too. Or you could try out a orange peel or clam shell all over the quilt too. Just think of the quilt as a whole piece of cloth and do a floral meandering. You could read a machine quilting instructional book. There are many of them out there. I started out with "Machine Quilting Solutions". You see, you have learned the piecing, now you must learn the quilting part. There are all types of quilting. There is the type for an everyday quilt, a upgrade to a nice quilt for when guests are there, and then there is the Oh My Goodness quilting for the shows. When you determine the function of the quilt, then you will know how you want it quilted.
A short reading of a quilting book gives you the understanding of the battings, needles, threads, designs, etcetera. You see?