I blame that no one has chosen themes simpler then some abstract philosophical deep thinking, metaphorical topic that bogs down anyone who doesn't know what to draw when they see the words that describe the theme.
Next Theme:
"A Philosophical Cat, chained to a Scratching Post while drinking Tea, dressed in a Top hat with Dancing Scones with Troll Faces, Guarded by a 1930s looking bulldog soldier "
:P