One Simple approach to Shade cells with patterns is to:
Select the cells you want to apply shading to.
On the Format menu, click Cells, and then click the
patterns tab.
To include a background color with the pattern, click a
color in the Cell shading box.
Click the arrow next to the Pattern box, and then click
the pattern style and color you want.
If you do not select a pattern color, the pattern is
black.
Also, you may want to look up "conditional formatting in
the Help. Then, of course, there's macro programming ...
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