Setting background color for all new design files

Is there a way to set a color in preferences or something to choose what the background color is? My old files used to have a background of #E5E5E5, but now it is set to #F5F5F5. This is a problem for me as F5F5F5 is close to one of our brand colors, so I need to go and manually change it every time. Is there a way to set a preference for the background colour in design files?