Changing the default background color
You have now changed ALL of your windows in ALL applications to this new color.  
go to the desktop and right click anywhere in a blank spot
select properties
select the appearance tab
In the drop down box that says "desktop" choose "window"
now click on the color swatch
You may choose from these or hit "custom" for more choices
You may choose from these or continue on by hitting "define custom color"
just keep hitting ok until all windows close.
you can change it back after you have finished creating your stationery.