Flower Painting in Watercolor. Charles Reid
Flower Painting Through the Seasons. Ann Blockley
Best of Flower Painting. edited by Rachel Rubin Wolf
Nature Printing. Laura Bethman (I've combined this process with watercolor to make interesting art.)
The Art Spirit. Robert Henri.
Writing Down the Bones: Freeing the Writer Within. Natalie Goldberg.
The Possible Human. Jean Houston.