To change Gridline color in Excel, use Excel Options, apply a custom-colored border to the cells, or apply a custom line color. Full details here.

You can change and set the background color for all of your Office 2007 materials, and all of Office's background-changing processes are similar across the entire platform of programs.

How to Change the Color Coding on a Microsoft Excel Graph Legend. Color can make it easier for people to identify important information, such as legends on an Excel graph. Professional designers ...

In case of an error, a triangle appears in the corner of the cell. You can change the Color of an Error Indicator from green to any other in Excel.

The default active cell format in Microsoft Excel isn't all that easy to see, but you can use this easy-to-implement code solution to change that.