Hmmmmm....I'm thinking of maybe going with a dual boxing theme here - in the manner of George Foreman and the esteemed Signor Balboa:
Rocky I, Rocky II, Rocky III, Rocky IV, Rocky V, Rocky VI, Rocky VII, Rocky VIII, Rocky IX, Rocky X, Rocky XII, Rocky XIII, Rocky XIV, Rocky XV, Rocky XVI, Rocky XVII, Rocky XVIII, Rocky XIX, Rocky XX, Rocky XXI, Rocky XXII, Rocky XXIII, Rocky XXIV, Rocky XXV, Rocky XXVII, Rocky XXVIII, Rocky XXIX, Rocky XXX (no...no! that's not what I meant...), Rocky XXXI, Rocky XXXII, and so on.
We have a lot of rocks around here. But it seems a rather impractical idea and I'm not sure I could get it to fly with the gardener in residence.