Since I have become obsessed with pattern and surface design, I've started trying to educate myself about the theory and principles that underlie great design.
Design*Sponge had a tutorial a while back from Julia Rothman. It was eye-opening to me because I have always made patterns digitally by applying the principles I learned in our 9th grade geometry class unit on M.C. Escher (essentially, take a shape away from one side, add it to the other, ad infinitem). And while this works for me, I think that sometimes the effect is too linear. Julia Rothman's approach is more low-tech, i.e. pen and paper and some paper cutting sleight of hand, but really satisfying. I think it results in a more organic feeling pattern, which is definitely something I want to explore more.
So, like any good nerd, I have also started reading this book,