This already exists, can't get more canned than that.
checkout mod_layout here:
http://www.tangent.org/mod_layout/
Granted it's not a perl module, but it works and is rather customizable...
>-----Original Message-----
>From: Alex Menendez [mailto:[EMAIL PROTECTED]]
>Sent: Wednesday, August 16, 2000 1:26 PM
>To: [EMAIL PROTECTED]
>Subject: canned footers
>
>
>hello, all
>
>I am trying to write a module that generates a canned footer for all
>html and cgi pages on my site.
>the html part is pretty easy and I have already implemented
>it. However,
>I am currently having trouble adding it
>to standalone cgi scripts that are not parsed by the server. I have
>tried a number of variations with mod_perl subrequests but none of them
>seem to work right. I also thought about reading the scripts
>contents in
>the module and using eval. However, that seems a little cumbersome.
>
>Have any of you implemented such thing before? Any ideas?
>
>-amen
>
