This worked really well for me. I turned my office into a zen den for the night: I used a desk lamp rather than main light, ganesh incense and a bit of meditation music. The actual atmosphere was at odds with the piece I was writing but it helped me focus.

It also helps when you don't have a two year old pouring water into your shoes.

My advice is to visit places or observe events that may bear relevance to your writing in order to absorb creativity. We had massive thunderstorms the other night so I spent ten minutes observing them to use in one of my threads. Sometimes, if I see a building or place I really like, i'll take a picture of it on my phone so that I can refer back to it later and use it.