Show-off Christmas lights is one of the worst things ever. I hate the bright blue/red/green/whatever/non-normal-white lights people but up. Also, more interestingly it seems that lack of taste seems to correlate the date people put up these ugly lights. More uglier the lights more before Christmas you see them. Of course, some might argue they are seasonal winter lights, which I can understand. After all, it's a dark long winter here, but I still prefer normal natural colored lights over tacky bling ones which just remind me about consuming mad Christmas.
Yes, and environmental light decorations. If you are really in to that sort of thing, keep them reasonably small, use less consuming lights, and most importantly turn them off when they can't really be seen. You could also get a timer which turns them on only for few hour. And if you think they still consume extra power, you might compensate it by turning few lights off in your house, this also saves you some money. Or, use candles, which of course results your house burning down.
Man I should start some eco-ego consulting business.