Lay out the flowers that you will be using for your centerpiece flower arrangement. Choose one or more large flowers to go in the middle of the arrangement plus several small and medium flowers. Try different shapes and colors of flowers until you see an arrangement that you like.
Place the glass marbles or florist foam in your vase or flower pot. Be sure to have enough of the material to hold all of the stems in your centerpiece flower arrangement.
Starting at the center of the arrangement, begin sticking the stems into your marbles or foam. Place the largest flowers first, then the medium and small flowers. Remember to keep your centerpiece flower arrangement balanced on all sides.
Add something whimsical and fun to your centerpiece flower arrangement for fun if desired. Examples include a small styrofoam-and-feathers bird, a painted wooden ladybug, or a small sign with a holiday or birthday greeting. Glue your item to a bamboo stick and stick in your marbles or florist foam.