In the download, you'll see two folders: Microsoft and Windows.
- Contains 4 wallpapers (3 for Microsoft, one for a recent device they came out with
- Divided into 4 categories: Windows 8, Windows 7, Windows Vista, and Windows XP.
All the wallpapers have a black version and a grey version, and in total there are 44 wallpapers. It took about a week to make them all.
Keep in mind that I only half-created all of these, the original background (and my inspiration) came from here: [link]