If you have tried to render raster art like bitmap, jpeg, and gif files into vector art in Gravostyle, you'll well aware at how difficult it is to maintain the overall integrity of the original image. Here is a service that we have started to use in our store called Vector Magic. Just click the name to go to their webpage. The user interface is very simple and the results have been encouraging. There is a charge to use the service, but it wouldn't take billing out many projects to justify the fee.