Shading the area between Bollinger Bands provides a different look and some people may prefer that to the default lines. This tutorial shows how you can create shaded bands.
Click on the green arrow on the right side of the “Overlays” section to expand. Skip to the next step if this is already done.
You can also use multiple shaded Bollinger Bands on a chart to find what parameters best fit your style of trading as outlined in this Blog article written by Chip Anderson. To add multiple bands, repeat the steps 1-4 from above.