I can relate to your SIL's thoughts. For lots of years I worried about ....or at least considered matching things. Then I took a quilt class or two and discovered that the loveliest quilts that I saw didn't "match" my house and I would never get to make anything fun or colorful if I worried about matching colors. So I also get that from relatives that things don't match but I'm having so much fun playing with colors that I would never have bought in the past. Just have fun...we don't live forever!!