I keep a few memorable objects on my desk and on the ledge by the window, but like to keep things minimal. When I write, I wear headphones and only sometimes have music playing in them. ;) It's most inspiring for me to do nothing but write, which means a silenced cell phone and a closed door. I fill the screen with my words, and I hide the computer when I'm writing in my journal.
I believe that a relaxed, clutter-free place is important for me, although I think that writers might like to experiment with different environments and see what works best for them. Besides here, I also like to write in nature, but rarely when there are other people too close by. I've also written on moving buses, which makes for a messier entry in terms of handwriting.
What does your writing space look like? Do you find that writing in different environments influences your work?