Go into fullscreen mode! Vector graphics! :D - Draw something, then click the "done drawing" button! - Drag the yellow light source (top-right corner) to cast shadows! - Click on the color picker (top-left corner) to change the line color! BE CAREFUL not to draw something too complex, or the shadows will get very, very slow.
A small project I made to try out a couple of different things! Draw anything you want (as long as it's not too complex) and cast shadows in different directions. There are variables for the shadow's length and opactity inside the project, and they can easily be changed from the stage, but I might try to incorporate them into the project somehow. Enjoy!