Well... I like them except for the "note" and the "important" icons which I
really don't like at all, sorry :-(
Actually, aren't the note and tip icons the wrong way around anyway?
Anyhow, from the tip column I do like the tango version, custom icon 2, or
custom icon 6.
For the "important" icon, I'm not that keen on any of the alternatives,
sorry :-( Just a suggestion, but how about a right-pointing arrow? Same as
the navigation right arrow, but a different colour (orange maybe)?