MIT Media Lab assistant professor Dr. Joseph A. Paradiso includes the above photo of his old Himalayan cat Gingerbread atop a synthesizer cabinet as part of his web page documenting his modular synthesizer. His collection of modules and writings about synthesizers are quite impresesive, and I've spent a bit of time looking through them. That is one of the fun things about looking for these pictures of cats and synths: it often leads to something more interesting.
Dr. Paradiso's synthesizer has received note in Keyboard magazine, and he had a synth rig featured at the 2004 PrixArs Electronic festival. He has some great photos of synth rigs from the 1970's as well.