Nice Xfce4 themes for Xubuntu 13.10.
Lubuntu XP theme: http://xfce-look.org/content/show.php/Lubuntu+XP+three+flavors?content=162880. A Windows XP styled theme for Lubuntu.
Windows 8 mouse cursor theme: http://xfce-look.org/content/show.php/Win8E?content=160758.
Vista styled Xfce4 theme: http://xfce-look.org/content/show.php/Vista+Royale?content=59665.
Matthew Farrell’s Theme 1.0: http://xfce-look.org/content/show.php/Matthew+Farrell%27s+Theme?content=99669. A nice theme that may be used with Xfce4 that looks like Matthew Farrel`s theme from Die Hard 4.0.
Wallpapers.
Beautiful Amanita Muscaria fungi: http://freethoughtblogs.com/entequilaesverdad/files/2012/12/DSC06744.jpg.
Windows 8 lock screen wallpaper HD: http://res.cloudinary.com/demo/image/fetch/w_2880,h_1800,c_fill,e_sharpen,g_faces/http://www.wallpele.com/wp-content/uploads/2013/03/Lock-Screen-Windows-8-HD-Wallpaper.png..
600 DPI Windows XP Bliss wallpaper: http://fc07.deviantart.net/fs49/f/2009/216/3/8/600DPI_Windows_XP_Bliss_by_knux_kiba_fan254.jpg.
1080p Windows 95 loading screen wallpaper: http://www.betaarchive.com/imageupload/2012-05/1337037864.or.49009.png.
1080p Windows 3.1 wallpaper: http://img.wallpaperstock.net:81/microsoft-windows-version-3.1-wallpapers_38698_1920x1080.jpg.
Funny BSOD wallpaper: http://www.neowin.net/forum/uploads/monthly_04_2013/post-27111-0-74501000-1366405665.jpg.