For over ten years Kathleen has been creating pebble mosaics in her studio on Toronto Island, Canada. Many of the pebbles used in the mosaics are collected from the local Lake Ontario beaches, some from further away, and others are imported from China and Indonesia. She has commissions installed in private gardens and public places, including Toronto's Canada Blooms annual flower show and Seneca College, King Campus, Toronto.

For two months in 2018 Kathleen was an artist-in-residence in the International Residency Program at the Olive Stack Gallery in Listowel, Ireland. Using exclusively pebbles collected on coastal beaches, she worked with locals to create two mosaics now installed in the Garden of Europe, Listowel. She was invited to return for another residency in 2020, unfortunately postponed because of Covid-19.

Over a period of three years, and in association with two other project co-ordinators, as well as community members from Toronto Island, she worked to transform an unsightly and garbage-strewn area on Ward's Island, Toronto. Willow Square is the result of these efforts: a public space featuring a 12' diameter pebble mosaic, a piazza, trees, shrubs and flowers, and a reconstructed Victorian-era wrought iron landing stage. Reviewed in the National Post newspaper and pictured in the Complete Pebble Mosaic Handbook.

In 2009 she completed both the introduction and the advanced courses in pebble mosaics with eminent pebble mosaic artist Maggy Howarth at Cobblestone Designs studio in Lancashire, England. In 2010 Kathleen directed and edited the two-hour instructional video The Precast Technique, produced by Maggy Howarth and filmed in the Cobblestone Designs studio.