GENEVA, Ill. - Greg Parcell isn't thinking about the 50,000 lights all around him, or the computer that has them blinking to the beat of "Let it Snow" on the radio. Instead, his mind is on what's missing as he stands in what seems the one empty spot in his front yard. "I still have to put up the penguins around the campfire," he says. Parcell, 47, is a toy soldier in a growing army of Christmas enthusiasts becoming more sophisticated at turning yards into blazing monuments to the holidays. New companies are cropping up with elaborate, automated decorations and...