The sky is the limit here on that one. Only your creativity will hold you back. Go online or go down to your autobody shop and look at their catalogs. It is all the same. The pinstripe for a car or truck will work on a boat just as well.
I wonder if they make a computer program for your PC that you can start with a blank boat pic and start adding stripe and color to it just to see how it would turn out.
Have fun and take pictures!