NOTE: This topic is updated whenever Microsoft releases a new theme for Windows 7. So keep checking this topic regularly to get instant updates.
NOTE 2: These themepacks also work perfectly in Windows 8 Developer Preview.
Microsoft has released 4 new themes "German Landscapes", "Germany: Mountains to Sea", "Impressions from Schleswig-Holstein" and "Magic Landscapes" for Windows 7 from Germany.
German Landscapes Theme:
A rustic cabin under a rich carpet of stars, a weathered bridge over a country stream, delicate pink tendrils of cloud in a twilight sky, and fields of golden wheat in the afternoon sun: The best of Germany's natural beauty is featured in this free theme for Windows 7.

Germany: Mountains to Sea Theme:
The rural beauty of Germany comes through every image shot by photographer Mathias Rehberg. Revel in the shorelines, fields, and mountain refuges he captured in his lens for this free Windows 7 theme.

Impressions from Schleswig-Holstein Theme:
The moods and seasons of Germany's northernmost state are on glorious display in this free Windows 7 theme by German photographer Mathias Kentrup. Hazy romantic summer skies, golden light on winter branches, and the region's beaches and waterways are captured with hypnotically rich colors and delicate textures.

Magic Landscapes Theme:
Adorn your desktop with some of the most beautiful landscapes on Earth, as seen through the lens of photographer Michael Breitung. Waterfalls, mountains, fields, and coasts fill this free Windows 7 theme.

Download the .themepack file, double-click on it and Windows will automatically install and apply it.
BONUS TIP: If you want to enjoy wallpapers included in these theme packs, you can use 7-Zip to extract the .themepack file and you'll get a folder "DesktopBackground" containing all wallpapers.
Thanks to our friend "Rob Margel" for sharing...
How to Download More Windows 7 Themes from Microsoft Website?
You can also download other official Windows 7 themes, Desktop gadgets and wallpapers from Microsoft using following steps:
1. Right-click on Desktop and select "Personalize" option. It'll open a new window, now click on "Get more themes online" link:

2. It'll open official Windows 7 themes page in your web browser. Alternatively, you can directly open the same page using following link:
Official Windows 7 Themes Page
3. From the above mentioned webpage, you can download various free themes, gadgets and wallpapers for Windows 7.
You can also check out lots of cool Windows 7 themes in our following section:
This article was posted by VG in following section: Windows 7, Windows 7 Themes.
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JustSayin
^^ Thanks VG! Keep up the good work, this site is great :)
Masroor Aijaz
oh.. Justin Bieber's theme.. Going to download it... I am really one of the fan of Bieber.. !!
Eric
woo mabinogi :D
KTown
I love Space by GTGraphics. Awesome theme
senthil
this is great... i have seen may third party themes for windows 7 but official windows themes are just simply perfect....
Hanada
Cherry Blossoms is awsome!!!
mark angelo
this is so gorgeous. i love this theme!
Kyle
OMGOMGOMG FRUIT NINJA THEME?! I LOVE FRUIT NINJA AND YET THEY THE THEME! WOOHOO!!
amiel
pretty limited themepacks, only changes wallpapers and sounds!
Laczyi
Thx