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.
Development was managed by Nintendo EAD and Nintendo of America, in conjunction with two other independent development companies: Polygon Studio was developed by the professional 3D graphics software developer, Nichimen Graphics; and Paint Studio was developed by Software Creations of the UK.