Not knowing how you're going to quilt this...LA, machine, by hand...I would suggest a stencil design. I use them for both my hand quilting and LA quilting so... I have a stencil of long flowing cattails that would look great in the white areas. Then I would probably STID along the outside edges of the blue areas and maybe add another stencil detail here and there throughout the blue areas. Maybe a small animal or something. JMHO but I too think feathers are overdone.