I quite like them, but as I don't have an equal amount of affection for all types of piercing, I'll also have to say it depends on the type and/or location.
Personally: (in regards to facial piercings)
(I've included pictures for those who aren't well versed in piercing, etc).
+- Single Circular Bar Bell lip piercing - centre, left or right (PIC1)
- Standard side nose stud (PIC2)
- Standard circular nose ring (PIC3)
- Venom Bite Style lip piercing (PIC4)
- Circular Bar-bell eyebrow piercing (PIC4)
- Tongue piercing (PIC5)
- Conventional circule ear piercings of most kinds
-- Bull nose-ring (PIC1)
- Centre bottom or upper lip stud (PIC2)
- Monroe lip stud (PIC3)
- Small circular eyebrow ring (PIC4)
- Anti Eyebrow (PIC6)
That about covers it all.
I especially hate the 'Anti-eyebrow'...