Scandinavian Style
Minimalist curtains are inspired by the clean, simple and natural elements of Scandinavian design. The idea here is light, airy, and flowing curtains – perhaps in a print or neutral colour. Fabrics used include cotton, chiffon, linen, and sometimes tulle. Often, these curtains only frame the window and are not meant for blackout purposes. However, you could pair patterned drapes with tulle for varying amounts of privacy, which is particularly helpful in certain rooms.
Japanese Style
Japanese design is known for intentionally creating peaceful atmospheres. Perhaps this type of design is popular right now because people want a peaceful escape from their stress-filled lives. No frills or bows, just 1 or more sliding panels can grace a window or door, sliding left or right to open and shut.
They are typically made with natural fabrics and materials. These are great for larger windows and patio doors. You can find them in neutral colours and designs inspired by nature. The concept of panels is similar to Japanese Shoji Screens which you can read more about here.
Or, get some more ideas here and put your own spin on this design concept, too!