I would plug it up completely so there's no drain and grow something in it semi-hydroponically.

First, go get a bag of long fibered sphagnum moss, take enough to fill the pot and place it in a large bowl of water and soak it well.

Take your pothos or whatever you want to put in there and knock off all the soil and clean the roots of any soil left on them.

Pot up your plant in the wet moss as you would with soil making sure the roots are imbedded in the moss well and then just pour enough water in the pot for there to be 1/2 to 1 inch of water in the bottom. It will wick up through the moss to evaporate and provide the plant with water. Toss in another cup or so of water when the surface starts to dry.

once every month or two, take the pot to the sink and run water through it to overfill and rinse the mineral build up out of the moss. In my experience the moss will last anywhere from a year to two years before it needs to be redone which is comparable to a soil grown pot. You can let it go longer but it isn't healthy for your plants to wait too long.

You could replace the moss with hydroton or some other LECA (Lightweight Expanded Clay Aggregrate) type product, it would work as well and not break down but it is heavier which is something to consider when hanging things on a wall.

Danny