What can I do to cover a portion of an ugly ceiling?

I removed a cabinet in my bathroom. It was above the sink and counter, up next to the ceiling. After the the cabinet was removed, it revealed a vent hole and a hole for a light fixture, with the wiring, and a hole I put in because I didn't know what I was doing. I would like something light, to attach to the ceiling to cover the holes. The space is about 5 feet wide and 2 feet deep.
Light fixture hole, vent hole, and my hole.  5' X 2'.
Light fixture hole.
Vent hole and my hole.
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