Give a drop-in tub a vintage look by paneling its exterior. To guard against rot on wood surrounds like this one, make the deck out of plywood topped by a sheet of waterproof laminate, and cap just the edges with solid stock. Use exterior-grade beadboard plywood for the sides, and skirt the bottom with baseboard. Last, paint the various wood components to match the laminate. Find all materials for less than $100 at home centers.