|TWO EXAMPLES OF ERASER BACKGROUNDS|
A really easy way to do this is to ink up the side of an eraser and use it as a stamp to add colour.
The example on the right uses three shades of overlapping brown - I've overdone it a bit here, to make the point, and would chose more subtle colours for a "real" card. The silver behind the stamped rope on the first card front is more the go.
Of course, its just a matter of what you like. I often just use the eraser technique to add a single panel of a subtle colour (use Versamark) behind a stamped image.