This is an overlay mosaic pattern worked in US terminology.
The pattern, Oh My Heart, was released on January 31st, 2023
This pattern contains 1 large, detailed panel that can be repeated to the desired width and length, as well as a separator panel.
You will need to know the basics of mosaic crochet but there are tons of videos for beginners on YouTube.
Mosaic crochet is a dense crochet, no “holes” so is ideal for blankets, rugs, runners, cushions, etc.
You can use a variegated/print/cake yarn and allow the yarn to change colour on its own or you can use two separate colours to create a contrast in the pattern.