Pattern Magic Volumes 1 & 2 are incredible. They illustrate how to make amazing and weird shapes (the text is all in Japanese but if you're familiar with patternmaking it's pretty easy to figure out).
Pattern Magic Vol. 1
Vol. 2- Amazon says that the book is not available on their site at the moment, but I know you can get both volumes on eBay. This link has some pictures of pages in Vol.2. If you do a google image search for them you could even just make the pattern from the pictures!