Start by having a repertoire of accessories; things for different occasions and different moods. Select versatile accessories. How about a favorite string of pearls? You can get a string of beads, too. Bracelets are all the rage and how about a big tote? Be light and casual when you dress. You want to look soft. You want your accessory placement to be deliberate.
My belief is that less is more. A carefully placed necklace makes a statement with its unobtrusiveness.