Who needs glob? It's almost a one-liner.

Toss out space holder, it's not needed, and use $" for the joiner string since it's already used for that :)
(local $" = "somejoiner" if you want to).

#!/usr/bin/perl

# http://perlmonks.org/?node_id=1142125

use strict;
use warnings;

sub glob_array
  {
  my @ans = @{pop()};
  @ans = map{ my $i = $_; map $i.$".$_, @ans } @{pop()} while @_;
  \@ans;  
  }

my @colors     = qw(red green blue);
my @directions = qw(north south east west);
my @numbers    = (1..3);

my $array = glob_array( \@colors, \@directions, \@numbers );

use Data::Dump 'pp'; pp $array;
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