A trio of colorful pebble "parfaits" makes a modern statement. Vary the height of the vases, the width of the layers, and the shade of the pebbles to make the arrangement visually striking.
Gather tall vases, straws, garden shears, assorted colored pebbles, a trowel, and fresh long-stemmed flowers.
Cut a straw to an inch shorter than its vase. Hold the straw upright; scoop in the pebbles, layering the colors.
Thread a flower into each straw (this will keep the stem straight and protect it). Fill the vases halfway with water.