I like them all except the messages one. It looks nice but I think maybe an ink brush and a parchment would've suited better? The current icon seems hard to remember and might get confused with "Task". Maybe you already thought about it and decided that the parchment would've been even more confusing... But this is just my opinion.
Actually, the idea came from traditional Chinese wine vessel.And many ancient Chinese used gourd as wine vessel. Even now, my grandfather still use it to install wine. BTW，Naruto is one of my favorite comic book.
These are so beautiful! They've got such a great sense of continuity from icon to icon. I think my only critique is that the blue of the "Matrix" icon only appears there. It would be nice if that blue could be fond somewhere else as well to tie it in better -- kind of the way the red is in more than one place, and the gray too. Maybe the turquoise of the beads in "Bin" could be a little brighter??