The first picture shows a Select Grade bundle of Avena, which is tied with raffia and trimmed for free-standing display. The second picture is of three bundles of Project Grade Avena (Oats), which are simply bundled with a rubber band. The third picture shows a pair of Harvest Centerpieces, created using Avena (Oats), Rice, and Golden Wheat. You can read about the construction of the centerpieces here
. The last picture shows one of the harvest centerpieces over a year after it was created. Note that the Golden Wheat and the Rice looks about the same, but the Avena (Oats) has transformed into a blonde and the husks have opened.