UPD: 2020.09.13
I’m glad to announce that mosaic crochet pattern is available for download. The description includes written instructions and diagrams. Each square is crocheted in the round from the center and outward.

Technic: Double filet crochet, Interlocking filet crochet
Type: Blanket / Afghan
Gauge: 5 windows by 5 windows in 5 cm
As long as your windows are square, using a different gauge won’t affect the design, but it will change the finish size and the amount of yarn needed.

Hook size 4.5 mm. Hook size needed to match the gauge.
Approximate yardage 4000 meters of yarn for each of your two colors, which is a total of 8000 meters of yarn. (4375 yards per colors, a total of 8750 yards of yarn). (18-19 skeins (3.5 oz) for each colors)

Size: 150 cm wide and 210 cm long (150 x 210 windows)

The pattern contains a graph and Right-Handed instructions.

Description is for 2x2 squares. According to the description, you can also crochet each square separately from another. A blanket measuring is 5x7 squares.