I found several patterns for isometric blankets, but they all used sc in the rhombuses.
I didn’t have much time to finish my blanket, so I made this pattern using dc.
You can use the yarn you prefer and a crochet hook that matches your yarn.
My blanket is 100 x 160 cm.
I used ca 9 balls of each colour.
Around the edge I crocheted a round of dc.
The pattern is also available in Norwegian.