I love the subtle surface design effects you can get with discharge paste. There are lots of ways to use it and we have some tips in the FREE Fabric Embellishing book study Ruth Chandler and I have created. NOTE: Fabric Embellishing is being re-released this fall so if you don't have a copy yet you will be able to get one.
You never know what result you will get with discharge paste. It depends on the base color of the fabric so it is often a surprise. I have a black that discharged to a beautiful blue.