Sticks & Stones Pebble Plaque: 3 cups flour, 1 cup salt, 1.25 cups water (plus up to 1/4 cup more). Beat ingredients together on medium until ball forms, if crumbly then add more water. Knead until smooth. Divide into 3 balls and place each on foil and flatten to a disc. Press pebbles/sticks into the dough. heat in oven at 275 degress on backing sheet for 2 hours then let cool.