colouring tissue paper to use as tarp.

I'm converting a truck I'm building from a covered up bed to a partially uncovered one. I've cut and heated wastebound sprue and shaped it into the rungs (is that what they're called?)
Anyways, I've been planing for months to try colouring tissue paper to use as stowage, tarps, etc, and this is a perfect opportunity, as I have no other choice
Anywhoo, I was just wondering how to go about colouring it. What colour would be good for this. Also, since I use almost exclysively acrylics, should I just paint the thing with normal paint, or thin it out. I'm afraid if I thin it out too much, once it dries it will be a faded colour.
Anyways, any advice from people who've actually done this would be great!
Thanks