What type of quilting are you comfortable with? I would SID around the wreath, then put a fill of some kind in the white - meandering, loops, whatever you're good at. I'd keep the quilting in the wreath minimal (maybe just SID around each block) and if you use a loftier batting and a denser fill in the white the wreath will 'puff up' a bit, giving more dimension. Holly leaves in the border.
Good luck, it's an adorable quilt!