No need to order a fancy arrangement from a floral shop.  Making a lovely Thanksgiving centerpiece isn’t as hard as it looks.  Here’s how:  Buy 3 bunches of flowers, choosing fall colored flowers in coordinating shades, and make sure each bunch provides a varying texture to the arrangement.  Start by holding three of the bushiest or tallest flowers (same type), and begin gathering the other stems, one by one, in a vaguely symetrical pattern around the center stems.  Continue until you have used all the stems (or save a few for a small bed-side arrangement).  Trim stems at an angle under cold running water, and place in a vase filled with sugar water.