I would avoid a WOW or Cream color - I think it will take away from the gorgeous, shimmery light fabric you already have. I think your best option is the light peachy color in your print fabric. As a few others have said - matching that color should make the other colors really pop! Love your fabrics!!
Possibly try this one Michael Miller Fairy Frost in Creamsicle - CM376 swatch
http://www.michaelmillerfabrics.com/...=Fairy%20Frost