The Nautiques used a combination of gel coat colors, pin stripe tape and stick on graphics to get their look. The pin stripes and graphics will come off easily enough with a little heat from a hair dryer. The big color pattern, however, is deep in the gel coat and can not be removed.
I strongly recommend against painting the hull.
1) Boats are hard to paint when they are sitting on a trailer.
2) A good paint job will cost a fair amount. A cheap paint job won't look that good to start with.
3) Boats get bumped a lot! Fiberglass flexes under use, especially when pounding over wakes and such. Paint does not hold up well under these conditions.
I have had friends who painted their boats. The friend who had a new air brushed graphic applied every year had a pretty nice looking boat. The friend who just painted his hull with a spray gun had a crappy looking color to start with and it got uglier every time he used the boat due to the dings, scratches and eventually large sections of the paint peeling off.
Also keep in mind that once you paint it you can never go back.......