Fools Day is close so if you would like to joke on your colleagues try TeamCity Fools Day plugin.
Please install it only if your organization can afford little disruption from the work as the plugin is a bit intrusive. Also, feel free to look into the code and tweak it.
The page has the version from the last year but it still works OK with TeamCity 5.0.3 (what a stable API :)
We might add something fresh to the plugin if we have time these days (our colleagues got a bit tired of the screen shooting last year), so watch for the plugin page updates.