Make eggs a day or more ahead of time. Mix 2 cups flour, 1 cup ground coffee (or coffee grounds), 1 cup salt and 1 cup water. Divide in 6 lumps. Press each lump around a small dinosaur toy, forming an egg shape. Bake in a 200º oven for 4 hours, or let dry 2–3 days. Hide eggs for the hunt. When found, kids can chip them open with a butter knife or spoon and use a brush to excavate the "fossil” inside. Tip: Have kids take their time, as if they were real paleontologists.