We're going back quite some time now as this was a Nintendo 64 title but it was real dream come true stuff to work on a Mario title.
I created sound effects and voices for this unique title.
Wikipedia has this to say about it:
Mario Artist is an interoperable suite of three games and one Internet application for Nintendo 64: Paint Studio, Talent Studio, Polygon Studio, and Communication Kit. These flagship disks for the 64DD peripheral were developed to turn the game console into an Internet multimedia workstation. A bundle of the 64DD unit, software disks, hardware accessories, and the Randnet online service subscription package was released in Japan starting in December 1999.