I bring them inside during the winter; in the spring I buy something like scotch moss, some kind of miniature ground cover that will stay short. I put it down in my mini hosta area and then lay out the pieces on it. Unfortunately a hard rain storm can scramble the pieces so I am constantly setting everything back up.
I am thinking I should buy some kind of container to arrange it all in. When a storm is coming I could just pull it all into the garage and save myself the work of constantly re-arranging it all.