The town of Des Moines, capital of Iowa in the US, revealed its new logo :

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This logo is composed of a blue arch representing the bridge of Des Moines.
This new logo represents the news elements of the town, the urban view, the transformation of the town et a new idea of the future that awaits us.

>>> Source : desmoinesregister.com
>>> Information sur la ville de Des Moines

During the Olympics game of beijing 2008 google as made a different doodle (custom logo) for each day of the event !