If you have tools, you could build shelves.

Maybe take some 1/4" wood and cut it to size for shelves. Then cut grooves in the sides of the box to slide them into. Slide, add lighthouses, and voila!

The only problem might be making the grooves, especially if you don't have the right tools. I'll ask my dad about it; he's handy with woodwork. I have to wait though - I'm the only person up at 5:30! (I wondered why these Fox News programmes looked familiar....I need to fix my cable so I can get local news on NBC!)