I would do small, vertical drop earrings.
I like these:
http://www.anthropologie.com/a.....plateType=
(Neutral colors make it work-appropriate, but not as vertical as some other options)
http://www.anntaylor.com/catal.....pe=Regular
(Also neutral, and more vertically-oriented than pair #1)
http://piperlime.gap.com/brows.....=746475002
(These would probably be the most flattering. The lines are very strong and vertical, with the oblong shapes, and they seem to be small enough to be work-appropriate while still maintaining a bit of an edge--I would call to double-check on the size, though, since it's not listed. I'm guessing they're smallish based on the size of the chain and the posts, but that could be deceiving, I guess)