Cuckoo updates your Twitter avatar based on the time of day.
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Edit config.php.
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Replace 1.png up to 7.png with the avatars you want to use (1 being the earliest, 7 the latest).
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Create a cron job to fetch index.php on an hourly basis.
0 * * * * curl http://yourdomain.com/cuckoo/ -s
This uses Codebird https://github.com/mynetx/codebird-php to update Twitter and the Weather Underground API.