Here are some articles from John Piper's website on imagination:
God Is Not Boring
Jesus Is Precious Because We Yearn For Beauty
This idea of Christian imagination is something that has been simmering in the back of my mind for quite some time. I think it's often a neglected aspect of Christian life. We crave imaginative descriptions and depictions of the truth and beauty of God without even knowing it, and when we come across them they permeate both the mind and heart.