I used the Shapeways Creator App that allows you to make an extruded shape from a black and white image. You can control the size and depth in mm and if you want to experiment with texture, the gray-scale selection can be chosen as a variable.(If using my Backing Template in following steps, size your Footprint to around 60mm.)

Upload the Edited Picture of the footprint to the Creator App. Adjust the settings until the preview is what you want and click the Download Model link in the bottom right corner.

This will save a output.x3db file to your computer.