If you have a web server on your machine, check out hacker's MoDetails v0.2. Here is the relevant code if you don't have a web server or just want to see the output via command line:

use strict;
use ExtUtils::Installed;

my $inst = ExtUtils::Installed->new();
print $_,$/ for $inst->modules();
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jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)