Setting Outlook Themes

[Southernwave]

Can I set the OUTLOOK themes from my Excel macro ?

I have the following macro that sends emails .. I would like to automatically set the background template in OUTLOOK

Sub SendEMail()
    Dim Email As String, Subj As String
    Dim Msg As String, URL As String
    Dim r As Integer, x As Double
    Range("DataRow").Value = ActiveCell.Row
'       Get the email address
        Email = Cells(ActiveCell.Row, 17)
        
'       Message subject
        Subj = "Your Requested Piece of Music"
'      Compose the message
        Msg = ""
        Msg = Msg & "Dear " & Cells(ActiveCell.Row, 11) & "," & vbCrLf & vbCrLf
        Msg = Msg & "Thank you very much for your request ." & vbCrLf & vbCrLf & "I am pleased to inform you that your requested piece of music .... "
        Msg = Msg & Cells(ActiveCell.Row, 3) & "  by  " & Cells(ActiveCell.Row, 2) & ".... will be broadcast on  " & Cells(ActiveCell.Row, 9).Text & " ." & vbCrLf & vbCrLf & "I hope you enjoy it." & vbCrLf & vbCrLf
        Msg = Msg & "MA" & vbCrLf
        Msg = Msg & "US"
'       Replace spaces with %20 (hex)
        Subj = Application.WorksheetFunction.Substitute(Subj, " ", "%20")
        Msg = Application.WorksheetFunction.Substitute(Msg, " ", "%20")
                
'       Replace carriage returns with %0D%0A (hex)
        Msg = Application.WorksheetFunction.Substitute(Msg, vbCrLf, "%0D%0A")
'       Create the URL
        URL = "mailto:" & Email & "?subject=" & Subj & "&body=" & Msg
        
'       Execute the URL (start the email client)
        ShellExecute 0&, vbNullString, URL, vbNullString, vbNullString, vbNormalFocus
'
End Sub

I have looked and read but can work out if I can or not .. or how

Thanks in advance