Are you wanting to apply the colour to any paragraph that begins with a tab? If so, you could try this...
Code:
Sub ColourTabParas()
Dim aPara As Paragraph
For Each aPara In ActiveDocument.Paragraphs
If Left(aPara.Range.Text, 1) = vbTab Then aPara.Range.Font.ColorIndex = wdBlue
Next aPara
End Sub