Because they are so small, it is easy to overlook the beauty of mosses. The mosses represented in this drawing are identified here:
This beautiful drawing is by Ernst Haeckel (http://en.wikipedia.org/wiki/Ernst_Haeckel). Haeckel also drew lichen (http://en.wikipedia.org/wiki/File:Haeckel_Lichenes.jpg), and orchids as well as animals. You can look at the book _Kunstformen der Natur_ online here (http://biodiversitylibrary.org/item/104650#) and here (http://en.wikipedia.org/wiki/Kunstformen_der_Natur).
Haeckel also is known for his observation that "ontogeny recapitulates phylogeny" (the illustration of that idea (redrawn from Haeckel's original by Baer) is probably familar :http://en.wikipedia.org/wiki/File:Haeckel_drawings.jpg)
Here's a nice review article putting moss (and liverworts) into an evolutionary perspective: "Major transitions in the evolution of early land plants: a bryological perspective" (http://aob.oxfordjournals.org/content/109/5/851.abstract)
I also like this article, which examines moss's ability to tolerate drought and desiccation, and the lessons that can be extracted from them towards improving these traits in vascular plants. (http://mplant.oxfordjournals.org/content/2/3/478.full)