Birgit Broms limited her repertoire to certain themes in rich compositions full of variety and nuance. Broms began with small detailed sketches that gradually got more and more abstract form. The process was time consuming, which meant that production has not been particularly large and exhibits were relatively rare. The influence of the Göteborg Kolorists and husband Ragnar Sandberg can not be ignored but Birgit Broms developed her own independent expression. Freedom and movement was a recurring element in her painting and her motifs consisted usually of skaters, archipelago boats and building facades. In the late 1970s she began to also work with portraits in which she depicted people whose faces she found fascinating, including Ingmar Bergman, Erland Josephson and Pontus Hultén.

Something that is recurring in Birgit Brom's artistry is movement and it became a challenge for her to create and transmit this force. Early on, she was fascinated by the skater's power and speed. Chilly colors reflect the winter and movement and the speed is felt in every brushstroke.