I read great books by other people so I can be inspired to do better with my own. I watch great TV shows and movies by smart, clever writers (for instance, Sherlock on PBS and other smart shows) so I'll be inspired to write smart, clever works of my own.
I've found the secret for me is to be careful what I allow into my mind. I don't feed it scary, violent, or stupid images or stories. I like to give it the best nutrition possible with great storytelling by master storytellers. Rereading the Harry Potter series every year is part of it!