to make a cover for a tissue box
Measure the length and width of the box and use a handsaw to cut a piece of wood using those dimensions. Cut a hole in the center of the wood that will let a piece of kleenex pull through it. Measure the inner walls thickness and using wood glue glue an L shaped block on the bottom of the lid on each corner so that when the lid is put on the box it is snug and will not move around.