With all the same caveats regarding scientific assessments of creativity, here's what your brain looks like when you're writing creatively (a blog perhaps?).
Some of the particular brain activations reflect the nature of the creative paradigm: invent a story using the words provided, with some prompts to "Be Creative" for certain trials (creativity was also assessed by some sort of consensus group later).
This task did not seem to powerfully activate imagery areas - perhaps rather this sort of creative exercise was more analytical, pulling out words from personal or episodic memory, and weaving them together into a narrative.
If we have to be creative for a living or serious hobby, it's probably good to be aware that idea generation from an analytical approach is different from the more imagistic kind involving the parietal lobes.
The right prefrontal area also took a front seat in this creative writing task - likely using its expertise in inference-making, pattern recognition, and personal memory retrieval. Involvement of the limbic (emotional) areas of the brain shouldn't surprise us, because playing with ideas is a kick.
Creative Story Generation and fMRI
Right Prefrontal and Episodic Retrieval
Eide Neurolearning Blog: Finding and Retrieving Patterns