Dominant themes in Geddes’ Painting work include surface, shape, texture, movement and balance. The interaction and repetition of shape and texture provide entry points with which to navigate the work. These elements are intuitively applied over subsequent layers of paint until a deliberate sense of rhythmic movement and balance is uncovered. Her painting involves a long process of layering and texturing with markings, circles, crosses and various X forms. For her, the shapes are not explicit references, but rather indeterminate points for the viewers own associations.

Geddes’ sculpture work further examines her interests in surface and texture and focuses on the deconstruction of the conventional use and form of canvas.  Her assemblages examine the breakdown between painting and sculpture by combining painterly methods with sculptural uses of space. She often incorporates non-fine art materials such as T-shirts and other everyday objects along with conventional ones. Geddes also uses canvas in an untraditional way: ripping it up, sculpting it and treating it with various wood stains and other substances.  By combining both mediums of painting and sculpture into one work of art Geddes’ sculpture work is an ongoing study of the two.

Major influences in Geddes' work have been Antoni Tapies, Eva Hesse, Robert Rauschenberg, Jackson Pollock and Cy Twombly.