This plugin add new option in you blog for use in 404 page. This is

Author:nanoKhrome (profile at wordpress.org)
WordPress version required:2.0.2
WordPress version tested:3.1.4
Plugin version:0.0
Added to WordPress repository:10-08-2010
Last updated:10-08-2010
Warning! This plugin has not been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
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Total downloads:1 210
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If you often change the template to your blog - then this plugin is for you. Sometimes it is very important to keep the text error page. Since some of these texts are large and change them do not feel like every time - you can save the text in the database. And only then retrieve it from there. And I will help you with this ...