Colors can play a very important role in defining your Christmas theme. If you decide to go the classic route, for example, greens, reds and golds are old stalwarts. If you want more of a modern twist, neutral or white colors  combined with white Christmas lights could be the best choice. And for an even more colorful twist, throw in some purples and blues along with a few silver and white ornaments. Mixing gold and teal accents create a similarly modern, yet stylish look.