What part of the brain does mental imagery come from? Does it come from the same part of the brain that is used for our eyes? Is it our eyes that make the pictures or is it something else? Visualization has eluded me for a long time and I wish neuroscience could help crack the mystery for me.

I did not get your question, Vision is just part of our eyes.
Image is formed in part of brain called Visual Cortex (Area 17). It help us appreciate colour, size, shape, motion, illumination and transparenay of objects around us. There is no separate areas for vision and eyes, both are part of same tract. But for eye movements which is a motor activity there are special nuclei in brain which sends out cranial nerve 3, 4 and 6 concerned with eye movements.

The OP's asking which area of the brain stores visual memory, or creates images. For example, when you dream, your eyes are not working, but you 'see' things.

Unfortunately, I don't know the answer. Perhaps a little search will solve your question noSkillz.

I don't know if I found it:

Parietal lobe - Wikipedia, the free encyclopedia