These are slippers modeled off of the character Gir from the Nickelodeon cartoon 'Invader Zim'. The main character, Zim, can be seen wearing these slippers from time to time in various episodes.
This was modeled in Blender 2.57 and exported to the other formats (All exported formats have been tested in Blender and Maya).
The pictures were rendered with a subdivision surface of 2; this was removed on export for every file but the main .blend file.
The cell shade effect was used with Blenders internal material node system and did not export to the other formats.
Please let me know if you have any questions, enjoy!