If the traditional (or not so traditional) cuckoo clocks are a bit too dull for your liking, you may want to take a look at this diddy. Artist Michael Sans stuffed and crucified a cuckoo, which died from natural causes, to his wall and hung a digital clock around its neck, Flava Flav-style. The cuckoo doesn't make any noises at designated times, but that could be easily fixed with the help of a tiny, conveniently placed speaker.
Unfortunately, this isn't for sale and building one of your own may result in a rather large fine thanks to the Federal Migratory Bird Treaty Act of 1918 and a severe protesting by those PETA asshats. I wouldn't mind doing this with one of the pigeons that always manages to designate my freshly washed car as their daily toilet.