The first knob is a modified "Terracita" style medallion from my friend, Marcia's book. It was modified to fit the knob, which is wood and was painted with pink nailpolish (why buy paint, when I have nailpolish?).
The next knob is just a simple swirl of colours with beads that are leftover from a kit that I have. I love the texture that the swirl evokes.