How to Make Colors Change With Validation in Excel. Excel's conditional formatting tool applies formatting depending on cells' contents. Validation rules can change cells font, style, size or border.

Click "Colors," a link located beside "Choose What Colors Will Be Seen in Previous Versions of Excel." Excel displays the default color palette. Select any color you want to change in the palette.

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.

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.

In Microsoft Excel, if a cell contains a formula that results in an error, a triangle appears in the top-left corner of the cell. The triangle is an error indicator.

This article provides step-by-step instructions for color customizing your drop-down list in Microsoft Excel.