That’s right - you can draw anything you like and add it to your flowchart or diagram! Using the 2013 version of Visio, you can find the drawing tools next to the Pointer Tool on the Ribbon. When you click on the little arrow, a drop-down menu will show up, and you can pick the shape you want to draw.
You can choose from: rectangles, ellipses, lines, freeform, acs, and pencils. Just click on one of them and start drawing different shapes. You can also combine shapes to make more complex ones.
With the pencil tool, you have complete freedom when it comes to your drawing so you can create intricate, one-of-a-kind shapes to suit your needs.