Casascius coins are used to illustrate many mainstream media articles related to bitcoin.  The most common representation I see in the mainstream media is either a heaping pile of 1BTC coins or a single 25BTC coin.  Has anyone ever seen, for example a 5BTC, silver, or gold bar Casascius used in the popular media?  And what are your thoughts as to which coin you associate with a visual representation of "Bitcoin"?  For me it is definitely the 25 BTC.