The Creation Station in Buellton is a great place to stop at. It is on your way into Solvang, right off the fwy from Santa Barbara.
Another great shop if you come further south is The Treasure Hunt in Carpenteria. It is also a great shop. I make it to both these shops at least 2 - 3 times a year.
I don't think Blue Island Quilts exists any more. It closed down a few years ago.
Santa Barbara Custom Quilting is a quilting service. I don't think it's a shop you can "shop" at. There really is not much in Santa Barbara, they all come down to Ventura and Camarillo and Thousand Oaks to shop.
Quilt Attic in Arroyo Grande and Old town quilt Shop in Orcutt are great stores but they are up the fwy a little.
If you are going further north there are a bunch of little shops that we hit on our "Central Coast Quilt Run" the first weekend in June each year.