Here for your inspiration are a few pictures of traditional Welsh wholecloth quilts, from a shop in Wales that sells them. The owner has also published a book on Welsh quilts (not all of them wholecloth, but all stunningly quilted).
http://www.jen-jones.com/Solid%20thumbnails.htm
Here's another book on I liked. It has a lot of gorgeous pictures, projects and drawings of traditional wholecloth patterns.
http://www.amazon.com/Making-Welsh-Q...7370542&sr=8-1
Good luck with your quilt!! It will be wonderful. A dear friend of mine is a wholecloth quilter and I love that kind of work.