Farnsworth Art Museum will present a four-week workshop on collage techniques led by Margaret Rizzio on four Sundays, beginning March 19, from 1 to 4 p.m. at the museum’s Gamble Education Center, at the corner of Grace and Union streets in Rockland. Rizzio will share her vintage ephemera and paper supplies to teach various collage techniques. Participants will explore the use of pattern vs. image, cutting vs. tearing, bold vs. muted colors, and textured vs. flat surfaces. Participants should feel free to bring collage materials they would like to incorporate, but there will be materials to share. The workshop fee is $145 for Farnsworth members, $169 for non-members, which includes a $25 materials fee. A collage by Rizzio is shown.