Please use the Emotional Jenkins Plugin instead.
Archived versions of this plugin remain available for download.

{jenkins-plugin-info:pluginId=emotional-hudson}

This funny plugin changes the expression of Mr. Hudson in the background when your builds fail.

The plugin is maintained by Masanobu Imai and is hosted on its own project site at Google Code. Also check Kohsuke's introduction of this plugin.

Once installed, you need to enable this on per-job basis.

Screenshot

Change Log

Version 1.3 (Nov 19, 2011)
Version 1.2 (Apr 16, 2010)
Version 1.01 (Mar 28, 2008)