Mail Merging To Outlook Needs Logo inserted

I have a mail merge routine set up that uses Outlook (not express).
The code looks like this:

Public Sub RunOutlook()
    'create message
    Set OutApp = CreateObject("Outlook.Application")
    Set OutMail = OutApp.CreateItem(olMailItem)
    With OutMail
        'the following line could be populated from a a field in a table
        .To = RecipientList!Address
        .Subject = RecipientList!Header
        .Body = RecipientList!messagebody
        .Display   'change to .Send to send without review
        '.Send
       
    End With
   
    'kill objects
    Set OutMail = Nothing
    Set OutApp = Nothing

End Sub

 I need to insert a logo above the message. I've tried playing with the signature within Outllook, but I'd like to do this without having to set up individual Outlook apps.

Any ideas?