I'm guessing here, but I think that there are rules about what should be on the medals - given that all the previous summer games medals are remarkably alike!
Some woman with a couple of sheafs of corn waving a laurel wreath, and/or a bunch or blokes lifting someone up.
In fact, from 1928 to 1968 the medals are all practically identical.
It's just as well, or goodness knows what the people who came up with that hideous logo and the truly awful mascots would have put on them.
Edited: 16/07/2012 at 15:06