For the dotted ones, I cut ovals out of felt and felted them to the big wool ball. You can see that I also added some leaf shapes on 2 of them. Use the Clover felting tool or a felting needle to do the felting.
I'm calling the other ones "atomic" pin cushions. (Steve likes these the best.) I sewed small wool beads to the big wool bead with 3 strands of embroidery floss. Run the floss through the bead to each spot where you want to add a new bead.
I cut little squares of felt in contrasting colors to put at the outside of each of the little beads. As I pulled the floss tight, it gathered up the felt and cinched the little bead to the bigger one. Knot the floss out of sight at the base of one of the little beads. Too cute!