Microsoft Visio - Shape Formatting
You can also format the shapes to give them a more professional or casual look as desired. To format shapes, select the shape in the diagram and format using the options available in the Shape Styles section.
You can select predefined shape styles or you can customize the shape using the Fill dropdown menu. To adjust the color of the shape border, select a color from the Line dropdown menu. The Effects menu allows to add special effects to your shape such as drop shadows or 3D rotations.