As long as it's sufficiently high and not excessively deep, use glass or wire shelving, or a cabinet with doors and interior shelving. Make sure that if a cabinet or heavy shelving is used, that you install wall anchors!
Hello Heather, Buy a wooden storage that fits over the tiolet. They have some draws, and shelves. If you don't like the color paint it. If you do, use a high gloss, it's easy to keep clean. Just a warm sponge will do the trick.