I've got a friend whose main hobby is studying the Bible. He is an inspiration to me, he's one of the people the Lord has put in my life to push me and that sort of thing is a mercy. Though, I must add, my friend has an unhealthy interest in the New York Yankees but, thankfully, this has not begun to affect his personality. Yet.
One of the things Gary will do is go buy paperback copies of the Bible at the dollar store and then begin some study on a certain topic. And for multiple aspects of his study, he chooses one of these Bibles, and marks the verses that apply to the particular facet of the overall study.
Here, from the ESV Blog is another version of the same idea.
Gary is just ahead of his time.