Actually, I've seen a few nice all-in-one Mac to aquarium conversions. I haven't seen any for the iMac, yet, but I bet that it would make a nice project.
If you want a good use for a Mac, try running Mac OS X Server on it. Just got a machine in at work running it; it's very nice to have a simple, powerful GUI that controls standard software like Apache, NFS, ect.
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