Big Magic by Elizabeth Gilbert (Great book about the Creative Process)
Glitter in the Blood by Mindy Nettifee (Loved the prompts provided in this book)
Writing Down the Bones by Natalie Goldberg (has a companion prompt pack that you can purchase)
Tiny Beautiful Things by Cheryl Strayed (Great book where she discusses advice provided in the Dear Sugar column about love and life.. I know a little outside the box but worth checking out)
Poetic Trials 