Have any of you tried using a different colored, or darker colored insert? I did this by using a 60 mm Christmas bulb, and then packing another layer around it (lighter colored, with a surfactant added) in a 70 mm Christmas bulb...I'm going to test it today...my biggest fear is, I'm going at too fast a pace, and won't make any $ due to all the little "extras" But it's so much fun!!