I just got my ears pierced a few weeks ago, so I'm just wearing the small white gold studs I was pierced
with. The girl at Claire's told me the piercing studs have to stay in for at least 6 weeks. After that, I could swap them out for something else.
When I originally got my ears done, I thought once the holes healed I might be able to leave my earrings out if there was something going on at work (conference, visitors, whatever). My experience in the weeks since is that no one really cares all that much, not even at work. I don't think I'll ever have to leave them out. I was surprised about the complete lack of concern expressed by pretty much everybody. I think I might just leave some type of earring in all the time.
I guess they're my favorites because it's the only pair I own.
In a couple more weeks, (I have two to go before I can take the piercing studs out), I might be buying some replacements, but I'm not sure what yet.