While his innovative technique for painting in oils brought him rave reviews, Griffin was equally talented with pastels and dry brush watercolors. Commended by Philip Hale for their ability to capture “the brilliant, confused, vibrating charm of nature in sunlight,” Griffin’s works on paper were intimate, poetic scenes rendered with flowing brushwork, expert draftsmanship and harmonious color. They were exhibited at the Pennsylvania Academy’s watercolor exhibitions and with New York’s Montross Gallery and Bauer-Folsom Galleries, and he was a member of the New York Water Color Club and the American Water Color Society.
 New York Times, September 3, 1908
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Today his work can be found in numerous private and museum collections, including the Florence Griswold Museum in Old Lyme, Connecticut, the Fogg Art Museum at Harvard University, the Bowdoin College Museum of Art and the San Diego Museum of Art.