There's an obvious perk to having multiple piercings: wearing more than one accessory at once. Especially since you'll find that experimenting with your metals and accessorizing will be twice as fun as it used to be.
That said, in case you're new to the double-pierced life, here's a starter combo to copy from Heart Evangelista:
Pairing a small blue topaz stud with a pearl drop earring from Royal Gem, the actress created a perfectly wearable and dainty mix. We love how she used the small size of the stud to her advantage by wearing it with something more striking in length, making both pieces pop at once. Not a bad idea for some subtle, everyday glam!