For this design I used Inkscape and Openscad  to make the 2D images into a 3D model. The image files used can be found here https://s-media-cache-ak0.pinimg.com/236x/b0/95/e1/b095e11aa7fab8f954896fc928c30f17.jpg, http://www.clker.com/cliparts/l/k/z/p/c/s/celtic-knot-hi.png, and http://vector-magz.com/wp-content/uploads/2013/12/celtic-borders2-197x300.jpg. These models were added to a basic plate model in Freecad. Cura was used to slice the model and was printed on a Athena Delta.