This is my personal favorite increase. in patterns you'll see this as KFB as in knit front and back. also known as a bar increase.
by ElisaAnne Calligraphy
by Meladora's Creations for Crochet
by Left in Knots
by B.hooked Crochet
by BonnieBayCrochet
by Blossom Crochet
by Red Heart Yarns