In the latest Spudvision blog entry, Steve Purcell shares a photograph of a superb piece of painted artwork he did for the back of the box of the enhanced releases of Maniac Mansion - a portrait of the Edison family, based loosely on an in-game sprite that can be found in the mansion's fourth floor den. One of Purcell's earliest assignments at LucasFilm Games, this is actually an image he's shared with the internet before, but since all our galleries are in hibernation you could very well find the reasonably large photograph of the framed painting, which is presently hung in Purcell's home, to be of value.
Source: Spudvision