DeviantArt – Windows 10, for those who are unaware of it, is one of the largest communities of talented designers and professionals. They create designs, their masterpieces, and often share peeks for others as inspiration and for review and also give away stuff for free. If you like to explore designs and spend lots of time making customizations, be sure to check out the offerings on this site.
On Windows 8
You also get some cool themes and theme bundles like the one from sagorpirbd @deviantart that is a collection of beautiful wallpapers and icons completely compatible with Windows 8/8.1. It is a pack of 10 variations that are all pleasant and splendid. These are listed as RTM themes and offer compatibility with 32 and 64 bit machines and operating systems, nevertheless.
• It is important to have some working knowledge of Classic Shell or StartIsBack Plus to be able to apply the patches. It will also help you revert back if something does not work as expected.
There are many talented designers on DeviantArt and you can take your own time to explore and see the styles and details of various offerings. A lot of them are free of cost and therefore you might not expect too much of functionality in terms of customizations.
• If the main focus is on elegant design and the look of your desktop, this is the site that you must begin with and later expand your search to other alternatives.
A theme is not the actual operating system or not even a transformation of its services, but just the UI or user interface which gives you the a new look and feel to your desktop, windows, icons etc. and it is up to the designer or the coder as to the level of personalization.