First select the cells you want to shade, and select format Cells in the right-click menu, as shown in the following illustration.
After you open the cell Formatting window, you can select shading colors on the Pattern tab, and then click OK when you are finished.
When the color shading setting is complete, you get the results in the following figure.
If you feel that monochrome shading is too monotonous, you can also choose the pattern style, as shown in the following figure.
Select the pattern you want and click on the "OK" button.
When the settings are complete, you can see the results in the following figure.