Chain 3 at the beginning of the round counts as a double crochet.

Chain 6 at the beginning of the round counts as double crochet and chain 3 space.

To change colors, work to the last 2 loops on the hook of the first color, yarn over with the new color and continue.

You will have to make 120 motifs to complete your blanket.

Crochet Heart Piece Blanket Pattern