I don't think your quilt is ugly by any measure. And for the sashing, have you thought of using a dark blue, to match some of 4-patches?
I think white is sort of stark; and the light blue is sort of wishy washy There is always the yellow, which would be really lovely.
No, my dear, had you seen my first quilt, yours would be - by comparison, a blue ribbon winner.
Besides, my step daughter, years later, asked me for that quilt, because she just loved it. She got it, but it did leave a hole in my heart. I loved it too.