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Dropbox doesn't have the option of removing it. I've seen it be requested but they always say it's needed to show the status. You can change it to B&W in the prefs and that's it afaik
 
Hold the Command key and drag unwanted icons off the Menu Bar.

Agreed x2. I had istat pro installed in the menu bar after not realizing that there was a widget available. When the demo had expired, there were annoying exclamation points where the stats once stood. I thought that the demo would remove itself. Tried appzapper to completely remove the app and it didn't work.

Tried the command button and moved everything to the trash successfully.
 
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