I saw this suggestion on another forum though (Trance Forum) which sounds appealing:
i think it would be possible to make one out of glue, starch, and newspaper and a giant beachball. inflate the ball, cover with the plaster, let it dry, deflate the ball...then use that sponge craft fabric thing to make the ears, plaster for the eyes....
or just hire someone who makes costumes to make it for u!
And here's a collection of pictures of how the original one was made
http://www.inthemix.com.au/gallery/s...7-deadmau5/aaa
It looks really fun actually