For the written pattern by Purpleiguana, check out the link below, and below that I have a second video showing how to alter this pattern into a more symmetrical crescent moon shape - ... ...
by Krystal Everdeen
by Kindabam Crochet
by Lanas y ovillos
by love crochet
by SweetRhapsody12
by BAG-O-DAY CROCHET & MORE