The other day I was on MS Excel and I wanted to have every other row colored, since it was really difficult to read due to the content that I had.  I found a really good solution where all you would have to do is to

1. Select the rows that you would like to color
2. Go to Format -> Conditional Formatting
3. In Condition 1 change it to select Formula Is instead
4. enter the following formula =MOD(ROW(),2)=1
5. Click on Format button
6. When then new box opens up, click on the Patterns tab
7. Pick the color that you would like, and then click OK.
8. Now on the Conditional Formatting dialog box, click OK.

Then enjoy your colors on every other row 😛

Source How to use conditional formatting to shade every other row in Excel.