Margery has worked with woodcuts since 1958, and her many prints are in collections throughout the United States and abroad. Margery has won numerous awards and distinctions with her work. The 1972 UNICEF Engagement Calendar had one of her woodcuts chosen for inclusion, and her work was used as a cover and feature story in the Today Magazine of the Philadelphia Inquirer. She has appeared on several TV shows to demonstrate the techniques of woodcutting and printing and has taught private classes for both adults and children.

Niblock was commissioned by many organizations to do special pieces during the time she made her home in Philadelphia, including The Institute of Pennsylvania Hospital, Atlantic Richfield Company (ARCO), American Friends Service Committee, Pearl S. Buck Foundation, and Developmental Center for Autistic Children. She also had numerous solo exhibitions in the area.

In 1989 Margery moved to Portland, Maine, where she has mounted two solo exhibits and illustrated a dozen books. In Maine, her drawings and woodcuts appeared in Greater Portland magazine and the Maine Times. She has also visited several Portland elementary schools and Deering High School to discuss her art with the students.

These days, Margery continues to draw and create her unique images on scratchboards.