It's sure hard to choose, but my 3 favorites are the links of love necklace and bracelet set and my Paloma Picasso hoop earrings (it's like having 3 pairs of earrings, since you can wear it 3 different ways)!
I always loved the Heart Link Necklace. I own the bracelet and earrings, but the piece retired before I could buy the necklace.