Be The Light, Matt 5;14 engraving settings for upcycled pallet wood,

Pretty straight forward.  Cut and sand the pallet block to the dimensions you want, drill a hole for the tea light using a 40mm forstner drill be, and engrave away.  You can then stain, wax, or varnish.  I would advise caution in using naked flame candles and suggets LED Tea Lights for safety