Unfortunately, Microsoft launched one of these themes as a paid version about a month ago. Many users who wanted to get that theme were disappointed with this move. Maybe that was the reason behind this free release.
Each of these wallpaper packs is available with 10 photos. Moreover, Indian users are lucky enough to get a total of 18 photos.
Microsoft describes the fabrics of India theme as:
Feast your eyes on the rich textures and intricate embroidery of these vibrant textiles. This 18-image set is free for Windows 10 Themes. These images are to be used as desktop wallpaper only.
All of these photos rotate based on your preferences. We can choose between a range of 1 minute to 1 day. Some users said that Microsoft needs to add a new option that allows them to keep their favorite wallpapers more than a day. In this way, they will have more time to enjoy their favorite themes.
Devices running Windows 10 Creators Update and later are eligible for these 4K themes. This means that you can also install them on your Windows 10 v1903 computer.
The theme packs are named as River Deltas, Fabrics of India, Panoramic Train Views, and Light Trails. You can easily install your favourite themes from Microsoft Store.
Theme Pack Installation
Now, wait patiently until your system finishes the downloading and installation process. Once the theme is installed, you can select your favorite theme by following this path.
Start > Settings > Personalization > Themes and select your favorite theme.
Generally, every new theme appears at the bottom of installed themes.