Actionscript:
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var colors:Array = [0xFF0000, 0x666699, 0x223322, 0xCCCCDD, 0xFFEEFF];
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var alphas:Array = [0, 1, 1, 1, 1];
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var ratios:Array = [0, 50, 100, 200, 255]
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var filter:GradientGlowFilter = new GradientGlowFilter(0, 0, colors, alphas, ratios, 30, 30, 1, 2, "full", true);
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var circles:Shape = new Shape();
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for (var i:int = 0; i<30; i++){
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with(circles.graphics) beginFill(0xFF0000), drawCircle(Math.random()*500, Math.random()*400,10+Math.random()*40);
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}
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addChild(circles);
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circles.filters = [filter];
I don't see GradientGlowFilter used much. But with some tweaking you can probably get some decent stuff out of it.