I've always liked what they do for the Hobies and F18s in Europe. They basically cover the sails with stuff (check out the H16 European championships sites).

Anyone Euro guys here know what they use over there?

When I had sponsors, I had a sailmaker do the graphics for my H16, but they were small, and the sail was Dacron, so I'm not sure if my experience will help you.

Having said that, I would think that a good sailmaker would be able to help. There are plenty of big boats here with graphics on their huge spinnakers, etc.

Mike