Old iMacs modified to become aquariums are not uncommon. There are even instructions on the Web to teach you how to make one. Here's another mod for the Apple faithful, but it's for a purpose less therapeutic than watching fish swim around in a tank--hiding cigarettes.
Instead of just leaving her broken iPod in a drawer, 22-year-old Tara ripped out the innards and made it into a case for seven cigarettes. According to her blog post, she doesn't smoke much and, at her age, doesn't need to hide her smokes from teachers even if she did, so making it was purely for the cool factor.
We think that if someone can improve on this and make fire come out of the headphone jack on the top, it might even outstrip the iMac fish tank in popularity.