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 the color of the default gridlines in Excel from the File tab, by selecting Options, Advanced. In the Display options for this worksheet section, click the Gridline color drop-down box ...

Here is a tutorial to lock or hide only the formula cells in an Excel workbook. You can also lock formulas in all worksheets in a workbook.

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.

Save this for the spreadsheet jocks in your office—we'd bet even the experts don't know all of these formula tips.

Counting records or values in Microsoft Excel is easy. Counting individual cells by their fill color definitely isn't. Using an old function and a matrix tames the problem.