Please read the POD for the scripts in here; either with "perldoc",
or run them from the command-line and click the "Help" button, or find
them on the Gimp-Perl CPAN POD docs.
Other sources of inspiration:
http://www.ualberta.ca/~cwant/gimp/postprocess.html
Using Gimp-Perl for animation post-processing; some very neat effects
produced here.
http://www.gimp.org/tutorials/Basic_Perl/
Dov Grobgeld's excellent intro to Gimp-Perl, updated for 2.31