Removing drywall and putting in a handy storage shelf. Another good idea if space is sort of tight and you want to display things instead of using a curio cabinet. You could add a door/doors if you wanted the items protected.
First, I painted the toe kick black to give the illusion of a shadow under a leggy furniture piece. My next step to aid in the furniture illusion was to add legs to the cabinet. Because you hafta’ have legs on a leggy furniture-look vanity, right? One of my favorite catalogs is from Van Dyke’s.