Hi,
The color of the room's walls of ceiling have never been an issue for me ... I still write. I am not sure that I could ever think that it was the color of that wall, or the ceiling tapestry or the posters on the wall that made any difference in the work I do, but in general, if you are comfortable with yourself, I am not sure what is really needed, and anything is inspiration as much as anything else.
At times, contrast is good for me, though, as it gives me different stuff, but I tend to expand the ways of writing into different areas and such, that I was not able to do before, and again, I am not sure that is as much me and my age and comfort with the writing, than it is the room I do it in. In some cases, and poems, I've done them when I was at work in the middle of taking calls for database entries.
Thx for asking ...