You'll need a bucket, a pair of old jeans, bleach, thick rubber bands, and rubber gloves. Soak your jeans in cold water and then wring them out. Bind the jeans with several rubber bands. The rubber bands will prevent the bleach from penetrating the fabric (i.e.: the more rubber bands, the less bleached areas). Using your gloves, do a 50/50 mix of bleach to water in your bucket. Submerge the wrapped jeans into the bleach-water mixture for 15-20 minutes.