It is great to have an abundance of screen real estate via our wide screen monitors. But, if you have several Microsoft docs or spreadsheets open it is possible to get them confused and end up editing the wrong file.
I was wishing I could change the windows color to distinguish between open files, but came up with a good alternative (at least for Microsoft files). It is possible to change the page color on Word or Excel files. Just go to the Page Layout ribbon and select Page Color. You will get a drop down of standard colors you can select to change the background colors of your open files. This allows you to color code any open files so it is easy to recognize different versions.
When you are finished, it is easy to go back and select No Color to return to a normal white background.