Reading to Win is a monthly challenge I started last year. The idea is to read the books you've won or received as a gift. All genres, all formats, all lengths count; the only requirement is that you won it, online or offline, or that it was given to you, prior to January 1, 2016. It runs February 1st to February 29th, 2016.
Don't have a blog? No problem, make a dedicated shelf at goodreads, and link to it.