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 new theme "Roses" for Windows 7 users.
Roses Theme:
Known as "the queen of flowers," roses have been valued for thousands of years for their beauty and fragrance. Their connection to romance also spans the generations, popping up in songs, poems, and in lovers' bouquets since at least the Middle Ages. Savor the extraordinary beauty of roses in 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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raj
thnx
Antonios
Is there a possible way i could get themes to work on win7 Home basic version? This version does not have the personalize option, can we have it added by any chance?
salman
this is vvvery gooooooooooooooooooooooooood
Shabin
"Very Good"
manas
very nice theme
Shuvo
Themes r not good..........
Praveen’S
i love yours windows 7 themes.
vijay
this is very good!!!!!
Someone
@Antonios
Visit this link: http://www.askvg.com/personalization-panel-allows-you-to-change-desktop-wallpaper-get-transparency-and-much-more-in-windows-7-starter-and-home-basic-editions/.
Uewd
I liked the antarctic theme. It is nice and I felt cold when installed this theme. The country I live in is hot so that's good :D