How?!! Why, with chalkboard paint! You've probably seen it around, gaining a following lately, and trendy as it may be right now, it has been rocking the re-purposed for many a year before now.
All you'll need is one quart of chalkboard paint (in your preferred color... yes!!! it comes in a variety of colors) + some sand paper (110–150 grit) + a roller handle and of course you're own refrigerator... unless your landlord is über awesome.
you'll paint 3–4 coats of the chalkboard paint... follow the directions on the back of the can for drying times.
When you're done you'll have this, but...you'll have to wait a few days before you can condition it with chalk (second picture).