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Thick yarned hat, as well as a Bella "La Push" hat.

Striped hats

All done with half double crochet; two with alternating single crochet strips.

Using up the rest of the green yarn

Using the "brain waves" pattern, for the wavy one, single crochet on another, and half double crochet on the multi-striped one.

Leftover yarn hats

Mostly done in half double crochet, with the exception of one done with a popcorn stitch.