I don't know what this library is doing, but from the name, perhaps you can do most of its functionalities with simple PGraphics.

This lib is really interesting and as you said, it plays with PGraphics.

I checked a lib named Layers but it is not Processing 2.0

Does that mean you actually tried it, if not try downloading the latest version of Layers and manually install it into Processing 2. Try the examples and see if they work, if they don't the error messages might hint at what needs to be done to port it.

Alternatively contact the creator and see if they intend to update the library.

yes I did that.