there is a new concealer at sephora thst is supposed to be good for covering up tatoos. Maybe it would help with scars too. I"m thinking about trying it..
http://www.sephora.com/browse/product.jhtml;jsessionid=L3N3IBKU5TKBQCV0KRTQX0Q?id=P231113&categoryId=C18697
Prescriptives is a good brand too and they will match your skintone if you go to the counter.