This is where we can get some ideas from Lomography. For instance, put your film in a dishwasher: http://www.lomography.com/magazine/t...the-dishwasher
Or, you can try chemicals, like bleach, making film soup, roasting in the oven, or many other ways to torture your film. http://www.lomography.com/magazine/l...emical-cowboys
I have not personally tried these, but the results are interesting.