I do not remember every seeing Google swapping out their inner page logo before. Of course they mess around with the logo on the homepage often, but I don't remember seeing them swap out the inside page logo.
Here is a screen capture of the inside page search result:
![google-changes-inside-logo.gif](https://www.seroundtable.com/archives/google-changes-inside-logo.gif)
Here is today's Olympics Logo:
![summer2004_archery.gif](https://www.seroundtable.com/archives/summer2004_archery.gif)