Highlighting The Active Cell

If you want to make the active cell appear in a special color, use the following code in the Workbook_SheetSelectionChange event of the workbook.
Private Sub Workbook_SheetSelectionChange(ByVal Sh As Object,
    ByVal Target As Excel.Range)
Static OldRange As Range
On Error Resume Next
Target.Interior.ColorIndex = 6 ' yellow - change as needed
OldRange.Interior.ColorIndex = xlColorIndexNone
Set OldRange = Target

End Sub