Since the litho's have a white border around them, i guess its not to advise to use a white mat, but a more contrasting one?
I was thinking about this color (wheat)

with a black frame.
Or should i go for a more contrasting one? Its so hard to choose.
I prefer to have the same color mats for all my artwork so have a more rustic view.
I dont like those antique painting like frames. It will be a modern frame.