Excel provides a tool you can use to cycle though the available font colours. Though it isn't provided by default, you can add it to the Quick Access toolbar.

1.Click on the Office button and choose Excel Options.

2.Click the Customize option in the left side column and in the Choose Command From drop-down list select Commands not in Ribbon.

3.In the list of commands select Cycle Font Colour tool and click the add button to add it to the right hand side dialog box.

4.The Cycle Font Colour tool will be available on the Quick Access toolbar.