For smaller pictures, photos, etc. you often need a matching picture frame to the photo, the drawing etc. As a 3D printer owner, it should make sense to use CAD software to design your own picture frame and then print it out on your 3D printer.
Furthermore, the CAD design process can be a good exercise for improving your CAD-Software-Skills. In our example, an already existing picture frame made of wood in the small rectangular format approx. 140 x 140mm is used as a template: