When I look at these photos, I get into autumn mood.

“Quartet” mosaic pillow is a combination of 4 different but harmonious patterns. Each of which can be crocheted independently.

This is an intermediate mosaic overlay crochet pattern. The pattern is chart based, but it includes written patterns for each of the four patterns and also pillow construction instructions.
These charts have several special stitches. You can find a photo tutorial of those stitches in the pattern. A video tutorial is also available on my channel.