The fewer holes on a boat, the better. This is a pretty good rule to be mindful of, because no matter how little or seemingly innocent it is, there is no such thing as an insignificant hole on a boat. Typically, once they are there, they are there for good.
On Rasmus, we were pretty liberal with screws. We permanently mounted all sorts of stuff from spice racks to picture frames onto our walls with them. They worked great until we moved everything off the boat, at which point we uncovered a litany of tiny holes that the new owner had to cover up. On this boat we have decided to be more thoughtful of the holes we drill should we ever want to do a little rearranging, redecorating or, ya know, sell her down the line.
Enter: Industrial Strength Velcro!
We have the kind with sticky tape on either side and have found that this stuff is excellent for mounting just about anything to almost any surface a boat can offer up (wood, fiberglass, metal). When Scott first suggested using velcro as an alternative to screws I thought, "No way, not strong enough". Boy was I wrong. The photo below? Taking that picture off the wall required a tremendous amount of force to the point that I thought the glass was going to break. I was going to take off the spice racks pictured below to show you a "before/after" for those too, but they would not budge. That's a pretty strong grip. According to Wikipedia, a two inch square of velcro is enough to hold the hanging weight of a 175 pound person. I don't know if I would trust hanging from a building by a two-inch square of velcro if I weighed 100 pounds, but that's an interesting little factoid.
We use this stuff all over our boat, to keep cushion backs from falling over, to mount electronics in discrete places and, of course, for our artwork and photos. Next time you get that handy dandy power drill out, think twice about drilling those holes and ask yourself, "Is this a job for industrial strength velcro?" You might be surprised!