The closet door is unfortunately one of those parts of renting an apartment for which we usually accept defeat. Since they are expensive to replace, we just make due with what's already there, whether we like it or not.
The truth is that making small changes to closet doors can do wonders to heighten the mood and intimacy of a room. Some great ideas are applying wallpaper or fabric, chalkboard paint, stenciled designs, murals, moldings, unique hardware, or any combination of the above. These are also sneaky ways to introduce bold choices into a space without committing them to massive expanses of wall. Because doors have architectural borders, they provide natural edges at which applications can be stopped.