I haven't embroidered all the hexagon centres with a specific motif. For some I have made up the embellishment as I went along.
This one, for example, is a buttonhole flower using variegated thread in shades similar to the surrounding fabric.
This one is a whipped chain stitch circle.
Mostly the embroidery is flat, but I did succomb to small bullion buds for one.
Some are more successful than others, but it is a lot of fun just playing around with such small motifs and breaks the long sessions of stitching he hexagons together.