2. Eye-catching art. A statement art piece is a wonderful way to express your signature style. Hang an over sized work (or a collection of smaller "related" pieces) above the couch or fireplace as a focal piece. With art, always go with what you like - you're the one who has to live with it!
3. Functional tables. As for coffee/cocktail tables, I always recommend really thinking about how you use your space before you purchase. Do you want a comfortable foot rest? Perhaps go with a leather bench or ottoman. Do you need extra storage? Go with a table that has shelves or hidden interior storage. Need flexibility? A collection of small stools or cubes can be bunched together to work as a table or separated to use as extra seating.