Try, for example:
Code:
Sub Demo()
Application.ScreenUpdating = False
Dim Tbl As Table, Cll As Cell
For Each Tbl In ActiveDocument.Tables
For Each Cll In Tbl.Range.Cells
With Cll
If .Range.Font.Color = RGB(255, 0, 0) Then
.Range.Font.ColorIndex = wdPink
End If
If .Borders.OutsideColor = RGB(255, 0, 0) Then
.Borders.OutsideColorIndex = wdPink
End If
End With
Next
Next
Application.ScreenUpdating = True
End Sub