Change Gridline color:

The gridlines help you track information on the screen easier and to locate cells quickly. Normally the gridlines are shown in black, but you may want to make them some other stylish color. If you want to change the gridline color, follow these steps:
1. Choose Options from the Tools menu. You will see the Options dialog box.
2. Click on the View tab.
3. Use the Color drop-down palette to select a color for your gridlines.
4. Make sure the Gridlines check box is selected.
5. Click on OK.
You can specify different gridline colors for each worksheet in a workbook.