I had one of these - 45s went on the top and albums on the bottom.
Rainbow Rice & Garden Sensory Play : I measured out the rice (4 cups) and put it in a Ziploc bag with about 2T of food coloring or liquid water colors (works great!) and 3 T of rubbing alcohol. The kids helped me mix the rice in the bags to spread the color. We put them on pans to dry in the sun. It all dried incredibly fast.