Five things that help me write, so I will share it all with you:
Mood:
-I have to be in a certain mood when I write. I can't really write unless I have a huge urge.
Setting:
-I find it is easier to write when I am alone in order to write something decent. I find it harder to write with people around. It's kinda distracting.
Ideas:
-When I have an idea I jot it down on a spare piece of paper or quickly type it down on my phone or ipod.
Music:
-Music will sometimes give me ideas on what to write about to. Sometimes a "songfic" may actually come to mind,
Audience vs What I like:
-I often write a piece on something my audience might want. Writing something that the audience likes gets me good feedback. Sometimes what I like interferes with what the audience might want. Perhaps consider yourself AND the audience to create something all new, you might like it better than you planned.