One of my favorite things about being able to paint and draw is the ability to customize the things I use. Stuff is boring sometimes, so why no make it your own? Feathers are great, among the tremendous variety there is a gold mine of crazy textures.
This is my "planner" [I have yet to not find a name that is not somewhat lame. Suggestions?]. If you are looking to improve your organization, start with one of these bad boys. I know I would be running into walls without mine.