Be consistent with color and theme. Two colors means sophistication (well, that's what the newspaper article said); for instance, use traditional green and ivory. And stars make a beautiful recurring them.
Mix fresh and faux greenery, including silver leaves and pinecones.
Think sparkle! This includes mirrors, glass, metal, beads, and candlelight [I think you can cut back on the candles; it's dangerous and is getting so trite]
Personalize stockings, ornaments, and napkin holders.
Decorate your doorway with a wreath [I love a friend's red wreath on her dark door] and flanking trees or poinsettias. [I love variegated poinsettias--Jingle Bells, Monet, Strawberries and Cream, ...]
Add Christmas touches to things that are hard to move, also pillows, antlers to the dog, etc. [Well, you can skip the antlers, but I have to confess that even I think they're sort of cute.]