use strict;
use warnings;

package Class::SomeMethodMaker;

sub create_accessor {
    my %hash = ();
    return sub {
        my ($self, $value) = @_;
        $hash{$self} = $value if @_ > 1;
        return $hash{$self};
    }
}


package MyClass;


{ no strict 'refs';
  *{"MyClass::colour"} = Class::SomeMethodMaker::create_accessor;
}

sub new {bless {}, shift}

1;

__END__

##</code><code>##

use strict;
use warnings;
use MyClass;

for my $colour (qw /green yellow/) {
    my $obj = MyClass->new;
    $obj->colour($colour) unless $obj->colour;
    print $obj->colour, "\n";
}

__END__