Dotted Plish

<?php

// Loading plish from hard drive and getting plish dimentions
$plish = imagecreatefrompng('plish.png');
list($x,$y) = array(imagesx($plish),imagesy($plish));

// --- Creating black image with dots

// Creating new image (black by default) with dimentions of a plish
$dots  =     imagecreatetruecolor($x,$y);

$white =   imagecolorallocate($dots,255,255,255);

// Placing dots over black image
foreach(range(1,100) as $num)
    imagefilledellipse($dots, rand(0,$x-1), rand(0,$y-1), 5, 5, $white);

// Blurring black image (5 times).
// At this point we have black background with white blurry dots
foreach(range(1,5) as $i)
    imagefilter($dots,IMG_FILTER_GAUSSIAN_BLUR);

// Copying white from dots image back onto plish
for($xi = 0;$xi<$x;$xi++){
    for($yi=0;$yi<$y;$yi++) {
        $alpha = (1 - ((imagecolorat($dots,$xi,$yi) & 0xFF)) / 255) * 127;
        if($alpha>0) {
            $pixel_color = imagecolorallocatealpha($plish, 255, 255, 255, $alpha);
            imagesetpixel($plish, $xi, $yi, $pixel_color);
        }
    }
}

header ('Content-Type: image/png');
imagepng($plish,null);