I have been spending time thinking about natural dyes in the easierst lightest way. India Flint's book, "Eco Color" is a classic on the subject. In one of the chapters, she describes the easiest way to use natural dyes: use color water and time. If you want to make the process even easier, use protein fibers: silk or wool. The natural colors in plant dyes bond naturally with protein fibers. If you use cellulosic fibers (cotton or linen for example) you will need to use a mordant of some sort so that the color will bond.
Here are my initial experiments.