Happy Treadler,
I have the same sewing machine as you do. without box on the right. Is this the machine you use in quilting? I bought mine 45 years ago at an auction for $3.00. Have not used it but tested it after I got it home. I have been thinking about seeing if it can be used , now that I've become a quilter. This board and my new quilting buddies all seem to be reccommending the old machines.
This is the first time I came accross another one like mine.
By the way regarding your color delima. In short go with bright, you may be changing your color tastes. This is a good way to start. Colors reflect our emotions and physic. Sometimes we need bright colors for a reason.
Enjoy you beautiful quilt. your SIL does not have to live with it.