First off this is a gorgeous quilt you have done a marvelous job of piecing it, and it is going to be very loved.
I would first stitch in the ditch around all the blocks, then quilt (meander around all the back ground(things you don't want to stick out) kind of densely. Like the bg of the fairies, and in the pin wheels do one color meandered, leave the other unquilted. The border pinwheels leave unquilted and meander in the back ground. Maybe a leaf vine in the thin solid borders, or just leave them outlined.
Whatever you do it will be beautiful. Enjoy the process.
Don't forget to label it.
Lucinda