looking for a website that shows quilt patterns by Possibilities; specifically the P.S. I Love You books?

Answer 1

When in doubt, go directly to the source. The Possibilities site is below. The second link is for Connecting Threads. While they don't have the books you're looking for, I had to add them because they actually show up to 12 quilts from the book (click on the book, then click "view inside images"). This is a great way to preview books, regardless of where you end up buying them.

Answer 2

http://www.quiltknit.com/books/possibilities_quilt_books.htm