Fimo polymer clay. First, I created a flower cane in the Millefiori technique. These are some of the basic steps: on the left, I assembled the petals and the white spacing slabs around the center. The petals are made of a stripy mixture of yellows and bronze. Some bead slices made from just the center cane are visible in the background in the two uppermost pictures. I then filled out the remaining outer space with the same white clay, to create a round white clay cylinder with the flower inside.
The flower pattern is then made smaller by rolling out the cylinder. On the upper right, I'm rolling out the cane with the tools I had available at the time - a plastic protractor and a flat-bottomed glass oven dish. Rolling the cylinder created a sort of interesting pentagonal shape at the ends, shown in the center photo. Lower right: when it was small enough, I cut the some thick slices from the cane.