Sub test()
Dim rngToColour As Range
Dim varLastValue As Variant
Dim intColour1 As Integer
Dim intColour2 As Integer
Dim intCurrentColour As Integer
Dim LstRow As Long
intColour1 = 2
intColour2 = 3
intCurrentColour = intColour1
LstRow = ActiveSheet.Cells(Rows.Count, "A").End(xlUp).Row
Set rngToColour = Sheet1.Range("A2:P" & LstRow)
varLastValue = rngToColour.Value(1, 1)
Do While rngToColour.Value("A2:P" & LstRow) < ""
rngToColour.Interior.ColorIndex = intCurrentColour
If rngToColour.Value("A2:P" & LstRow) < varLastValue Then
If intCurrentColour = intColour1 Then
intCurrentColour = intColour2
Else
intCurrentColour = intColour1
End If
varLastValue = rngToColour.Value(1, 1)
End If
Set rngToColour = rngToColour.Offset(1, 0)
Loop
End Sub

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