How can I easily cover nailed-up ceiling tiles?

Several years ago, a guy did a 1/2-#%@&d job of finishing the basement ceiling. Nailed acoustic tile to joists. Badly. Due to disability and lack of $, I need to try to cover the mess as easily and inexpensively as possible. I've secured them (you hear that, guy?), but would like to make it all look better. At least they are all the same color, but the visible cracks won't work when selling time arrives.

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