I made this one as a christmas present for my mom, it's made out of scrap pieces of bubinga, lacewood, cherry, maple, and walnut from previous wood projects (some of which are on Instructables like our kitchen table and my bubinga desk).
The details are in the photos above, but I'll outline the basic process here:
Collect your wood and layout the pattern. Make sure all sides are cut straight or planed so the glue joints will be tight.
Glue the wood together and clamp. When it's dry, plane or sand so the seams are flat. Then make all your interesting cuts, and glue back together. Then sand all the seams down again, sand with progressively higher grits, then finish with either a food-grade finish (like "good stuff", which is basically Salad Bowl finish) or a cutting board oil.