Move your mouse around! Also, try fullscreen!
Small and simple project I put together to try out an effect I had in mind. Everything apart from the light flares at the mouse pointer is rendered using the pen, so basially just the sparks themselves! If you go inside the project you can mess with the variables in the top left corner to change the look of the sparks. I'll throw some comments in there so it's easy to know what does what! :D Enjoy!