Here is what the application looks like while running. Top right is the original image. Bottom left is after the Sobel 3x3 matrix multiplication for edge detection, bottom right is the progress of the image being drawn (updated every 100 splines). The image currently being drawn is 582,225 splines making up Westminster Abbey and has been drawing for 30 minutes.
Real time video of one of the first renders I had my program trace. Its of a butterfly, only about 15,000 splines in this one so it drew pretty quick.