Super Search is your friend here. A search for "hourglass", for example, quickly turns up several nodes that may be of interest:

Creating progress bar
Creating hourglass using PERL
Cursor in TK

... and so on.

Update: This looks useful: Using Tk::ProgressBar

HTH,

#!/usr/bin/perl
use Tk;

my $mw = MainWindow->new;
$mw->geometry('-5-0');
$mw->overrideredirect(1);

my @color = qw/red green/;

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

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

my $label = $mw->Label(
              -bitmap=>'indicator',
              -bg=>'black',
              -fg=>'red',
              )->pack;

$mw->repeat(500,sub{$label->configure(
                               -fg=>$color[0]);
                               @color=reverse(@color);
 });

MainLoop;
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