Just produce. A lot. It's hard to produce original work in a medium without first mastering the medium itself. There's an old chestnut about the pottery class i

Just produce. A lot. It's hard to produce original work in a medium without first mastering the medium itself. There's an old chestnut about the pottery class in which half was graded on quality and the other on quantity; in the end, the quantity half produced better work. Picasso's early work, while technically good, was pretty run-of-the-mill as far originality. Also, as some other commenters have said, expose yourself to as much different stimulus as possible. If you're not an out-of-the-box thinker, this serves to make your box bigger.