Nowadays there is lot of variety in Curtains Fabrics type and not like before it was only cotton and Polyster Fabrics. We have now Sheer Fabrics, Embroidery Fabrics, Blackout Fabrics, etc.
You can also have Custom Fabrics like Fabrics as per your colour choice like you want slight grey or blue in your bedroom.
Shaded type Fabrics which will have light colour at top and then it's relevant dark colour at bottom, this type of Fabrics is nowadays most running.