I second Judy Martin's book. You can see pictures of quilts made from that book on her "Viewer Photos" page. It's the third book listed:
http://www.judymartin.com/Viewer-Photos.cfm
Also, pineapple quilts are log cabin variations. I love pineapple quilts.
Here's a google image search for "log cabin variations".
https://www.google.com/search?q=log+...FeveigLepoDoAg