The built-in InputBox
function doesn't support custom backgrounds. You can build custom dialogs using the Internet Explorer COM object, though:
Set ie = CreateObject("InternetExplorer.Application")
ie.Navigate "about:blank"
ie.document.title = "some title"
ie.ToolBar = False
ie.Resizable = False
ie.StatusBar = False
ie.Width = 300
ie.Height = 150
Set style = ie.document.CreateStyleSheet()
style.AddRule "body", "background-image: url('C:pathoyour.jpg')"
Set style = Nothing
Do Until ie.ReadyState = 4 : WScript.Sleep 100 : Loop
ie.document.body.innerHtml = "<p><input type='text' id='userinput'></p>" _
& "<p><input type='hidden' id='OK' name='OK' value='0'>" _
& "<input type='submit' value='OK' onClick='VBScript:OK.Value=1'>" _
& "<input type='submit' value='Cancel' onClick='VBScript:OK.Value=-1'></p>"
ie.Visible = True
ie.document.all.userinput.focus
Do While ie.document.all.OK.value = 0 : WScript.Sleep 100 : Loop
If ie.document.all.OK.value = 1 Then
'user pressed [OK]
Else
'user clicked [Cancel]
End If
Of course this is just a very basic example, so you most likely need to further customize the styles as well as the HTML code. One possible improvement would be the inclusion of the background image in the form of a data URI:
style.AddRule "body", "background-image: url(data:image/jpeg;base64,/9j/4AA...')
That way you won't have to reference an external file for the background. There are free online encoders you could use for encoding image files as base64, for instance this one.
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