Hi Clark, I'm a big fan of your work and hope to attend a workshop soon. A book that I initially thought was weird but have come to appreciate is Bill Creasy's pastel book. I think it's called 'Pastel Techniques' or something equally generic. Creasy is one adventurous pastelist. He combines pastel with all earthly elements--including ballpoint pen! He forces one to think outside the box and to experiment freely with art in general. LandK, MaryB