tile substitutes and plumber smashed my tiles

The plumber came i on Tuesday to repair a broken water main valve in my bathroom
This necessitate having to smash though three tiles ... the one where the main valve is situated .. the one to the left and the one to the right
Fast forward a few days and I am thinking it would be better to NOT close it up completely in case I need to get at the pipes later on in the future.
So I am looking for a tile substitute? I was thinking of measuring the distance width and height and going to home depot to have a piece of wood cut up into those dimensions and perhaps a hole bored in the middle
Any ideas?
Its a bathroom so aesthetics isnt my primary concern
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Cedar T&G or Cedar wainscoting.
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