My idea for an unconventional staff is having three sets of three pitchers that all throw three innings each every three days. Mix and match lefties and righties in each group so opponents can't just stack their lineup to one side. Also try to mix different pitch styles, flamethrowers with guys with nasty breaking stuff, etc. Those three groups take up 9 roster spots, which still leaves you with 3-4 guys for spot matchups, or relief for someone having an off day, or just to give someone a day off every now and then. Since they're only pitching three innings they can throw a little harder than if they were trying to go six or seven innings, and they only need to have two decent pitches since they're only facing most batters just once.