The Lubuntu Artwork Team is proud to show you all the new default artwork, including the wallpaper (and a radical scaly deviation for reptiles :D), the improved GTK2/3 themes, a new sexy app button, and the (always) evolving icons. There's a lot of work during the release cycle, as upgrades that all users will receive. Have a look:
Also, I'd like to thank the 3rd collaborators we had to make this icon theme. It's lovely how you're involved in this project that is (I hope) making Lubuntu a bit more famous. And remember, feedback is appreciated!