Being a huge Blizzard fan, I got a hold of World of Warcraft theme for my desktop! and I loved it. Here’s the screenshot
The best thing about this world of warcraft theme is that you don’t have to install or configure any third party theme software like windows blind etc. Just download the warcraft theme and install it!! Looks real good 
This world of warcraft theme is totally free for everyone, it’s around 6.6MB in size.