silicon art

At my first company, I saw the following examples of 'silicon art':

• Busby - A small, cartoon canary who British Telecom used in advertisements at one point.
• Steam Train - Spotted on a video delay line IC, (the regular, shift register structure resembled a rail track).
• A pair of breasts - Can't remember what this IC did, but the acronym for its name was "T.I.T.S."

Strangely enough, our company discouraged the inclusion of such 'silicon art'. The technical reason being that such structures caused DRC violations and that the fab. engineers didn't like them because they were yield hazards!