D1: Change separator line color in string grid?

Is it possible to change the color of the line drawn to separate rows
and columns in a TStringGrid? I am trying to make an "exploded" grid
with extra space between each cell. Setting GridLineWidth (I think) to
10 gives me the spacing that I want, but it's colored clSilver instead
of clBtnFace, so it sticks out somewhat oddly. Any ideas how to change
the color of the inter-row and inter-column lines or to work around this?

I did try modifying the OnDrawCell event to use less than the full cell
height and width, but the edit box that comes up uses the whole area -
an aesthetically displeasing effect!