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	Dein Code 
Sub Formatierung()
Dim i As Long
Dim c As Integer
Dim a As String
    i = 2 'Start in Zeile 2
    c = 35     ' 1. Farbe
    Do While (Cells(i, 1) <> "")
        If (Cells(i, 1) <> Cells(i - 1, 1)) Then  'Überprüfe ob Differenz zur Vorzelle in Spalte A
            If c = 35 Then
                c = 36   '2. Farbe
            Else
                c = 35 '1. Farbe
            End If
        End If
        Rows(Trim(Str(i)) + ":" + Trim(Str(i))).Interior.ColorIndex = c
        i = i + 1
    Loop
End Sub
	Stopt wegen der "" - Bedingung an der ersten, leeren Zelle 
Sub Sowas()
Dim rngData As Range, rngA As Range, rngC As Range
Dim lngIntC As Long
   lngIntC = 35
   Set rngData = Range(Cells(2, 1), Cells(Cells(Rows.Count, 1).End(xlUp).Offset(1).Row, 1))
   Set rngData = rngData.ColumnDifferences(rngData.Cells(rngData.Cells.Count))
   For Each rngA In rngData.Areas
      For Each rngC In rngA.Cells
         If rngC <> rngC.Offset(-1) Then
            lngIntC = IIf(lngIntC = 35, 36, 35)
            rngC.EntireRow.Interior.ColorIndex = lngIntC
         Else
            rngC.EntireRow.Interior.ColorIndex = lngIntC
         End If
      Next rngC
   Next rngA
End Sub
	  
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