I realise that I'm not being particularly helpful here...sorry...but may I also add has anyone made a "The Pie Hole is Open"/"The Pie Hole is Closed" sign.
This is a scan of my "The Pie Hole is Open" T-Shirt to give you an idea of what the sign looks like (at least the "Open" side anyway). I haven't managed to find an image of the "Closed" side yet.
If you take out the "is Open" part you could also make labels for a Pie box.