Ken Macklin, the artist behind Maniac Mansion's iconic box art (and who was supposed to do the Thimbleweed Park box), was interviewed last year about the development of said art. It's brief but you'll be glad you read it. A year later.
Now all that's left is for somebody to leak all of Macklin's background art for Noah Falstein's version of The Dig. Anybody got that lying around?
Source: VGArc