Funny question. They are free, unless you have to pay for them. There are loads of free themes available and there's also some that wants you to install some commercial crapwares. The ones you find via Win7 itself are free, unless you count the cost of Win7 itself.
In short: Yes, unless it isn't.
windows 7 theme for XP are basically windows themes that can be installed on windows xp to give it a look similar to windows 7. See the link in the related links section.
Because windows 8 themes are basically still windows 7 themes, they just have windows 8 graphics as the background colour. Thier coding is still the same.
No, Windows 7 is not free.
you can download free window themes from the following websites- www.deviantart.com www.thepcmanwebsite.com
If you're using Microsoft Windows 7, you can find free theme packs (including some nice desktops) by Googleing "windows 7 themes" and click on Microsoft's own page. Otherwise just Google 'free wallpapers'.
No, Windows 7 Home Basic (and Window 7 Starter) does not support themes on its own. You can, however, download and install Personalization Panel which can run themes on your Home Basic computer.
If you mean "Visual Styles" by saying "Themes", the extensions of windows 7 and windows 8 visual styles are different. That makes it almost impossible to install windows 7 visual styles on windows 8. There may be other alternatives for it.
Yes, most of them will work.
not possible due to the fact on windows 7 dreamscenes require themes which windows 7 starter does not have
One can download themes for Windows 7 from the Microsoft store. These are most likely the most secure and stable theme for your computer. If you get themes from somewhere else, you are putting your computer at risk.
If you have a legal copy of Windows 7, then it's free for you.
There are several Mac OS X themes or OS X inspired themes available for Windows 7. Two of the popular ones are Snow Leopard by giannisgx89 and Leopard Mod by sagorpirbd. These themes or visual styles don't require any additional software. However, the do require the Windows 7 themes subsystem to be patched. Refer to the related links section for link to UxStyle - a simple and safe patch for Windows 7