This is what you will see when you walk in the door. I've got a great window that allows plenty of sunlight and access to all sorts of birds and creatures that don't know I'm watching them.
I always put the commentaries of the book I'm preaching through right on my desk for easy access. We are doing a summer series through Psalms right now.
I've turned my closet into a prayer closet. This is a custom prayer bench I had made about 5 years ago. I have a copy of our church prayer directory there and try to pray through it twice a month.
I have my books arranged in categories. The left shelf is biographies, preaching, bible study, theology, marriage, etc. The other left shelves are arranged alpha by author. The 2 right shelves are all my commentaries arranged by book of the Bible.
The commentary shelves are directly across from my desk.
These pictures are the most popular aspect of my office. They are clearly visible when you walk in and everyone wants to guess who they are. Top: Calvin and Luther. Bottom: Edwards and Tyndale.
The Piper shelf (that is no longer able to hold all my Piper books).