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.

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.