The Lubuntu Artwork Team is not sleeping. We're getting some UI revamped elements, improving the current theme and getting it to a higher level. Among the icon theme (being exhaustely developed), the GTK2 / GTK3 themes had been redesigned (for both looking better and integrate between them). Look how the PCManFM's toolbar look now:
Also, I'd like to remember to any reader and user that the Wallpaper Contest is still open and we accept submissions. Create a wallpaper and we will include it on the Quantal distro. Remember, you could be famous! Check it out at Flickr.