You will probably need to make your own icon if on Win32.

#!/usr/bin/perl
use warnings;
use strict;
use Tk;

#  from perldoc messageBox
#  -icon
#  Specifies an icon to display. On X11 any of the
#  builtin Tk bitmaps can specified. On Windows only
#  error, info, question or warning are supported.
                    
my $mw = tkinit;

my $bits = pack("b8"x8,
"...11...",
"..1111..",
".111111.",
"11111111",
"11111111",
".111111.",
"..1111..",
"...11...",);

$mw->DefineBitmap('indicator' => 8,8, $bits);

$mw->Button(-text=>'Press Me',
            -command => sub{ 
              my $message = localtime;    
              &send_message( $message,'indicator','green') }
            )->pack;

$mw->Button(-text=>'Press Me 1',
            -command => sub{ 
              my $message = localtime;    
              &send_message( $message,'error','red') }
            )->pack;

MainLoop;

sub send_message{
my ($message,$icon, $color) = @_;

my $mb = $mw->messageBox(
            -background => 'lightyellow',
            -foreground => $color,
            -icon       => $icon,
            -message    => $message,
            -type       => 'OK'
        );

}
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