Please read the whole description.
2.0 UPDATE!! Made to work on the newer Gnome-Shell(the one on Ubuntu 12.10).
Download → http://www.mediafire.com/?izkljxid5rf1asi
1.1 UPDATE!! Enhanced install and uninstall files. Background images included on the download file. If you use an older version of Gnome-shell(Ubuntu 12.04), please download that one.
Download → http://www.mediafire.com/?wvbro63epspp2b4
Run the file "Install.sh" through your terminal and follow the steps there.
▶ The "Install.sh" file was built to run over ⇒Ubuntu, Linux Mint and Debian⇐, I don't know if the directories are the same in your distro, if it's another. Nevertheless you can try to run the file, it won't, in any way, compromise your system at any point.
▷ If you are running a distro other than Ubuntu, Debian and Mint, you may check if the following directories are present in your system and then run the Install file.
〉/usr/share/Icons, /usr/share/gnome-shell/theme, /usr/share/themes
After installing through the Install.sh file, press Alt + F2, type "r" without these quotation marks and then press enter; otherwise just restart manually your Gnome-shell. Don't forget to switch the window theme, icons theme and GTK+ theme to "MixtureD" within your gnome-tweak-tool(to install this app type this on a terminal: sudo apt-get install gnome-tweak-tool).
▶ Gnome-shell is equivalent to "Gnome 3.x".
▶ Theme preview on Youtube: http://www.youtube.com/watch?v=O0HPn09WqqU
Gnome-shell only 「400kb」→
Background image link →
 - http://www.wallpaperpimper.com/wallpaper/Art_&_3D/Abstract/Imac-Gray-Background-1-6OZHQ55CKW-1280x800.jpg
 - http://2.bp.blogspot.com/-LJIvVysC_4Y/TyxX3EJn2DI/AAAAAAAAAxQ/DwVi37HV4Gw/s1600/konachan.com_-_104314_game_cg_huke_makise_kurisu_steins_gate.jpg
Credits to their respective owners, I just remade and edited the layout excepting the icons(Faience Icons).
Érick Oliveira Rodrigues.