something with weights.
seriously man, what are your current stats, how have you been training them, and what would you like to see? Strength gains? That 'capped' look? Are you an O-lifter looking to get his C&J up, or just a guy who wants a broad pair of shoulders?
Any form of pressing, but only one.
Some form of side raises, db, cable, machine etc.
That's it. Shoulders DO NOT need a lot of work and most reasons they don't grow is because they never get a chance to recover. If they still don't respond do higher reps.
Right now i'm doing reverse grip rowing for back and this seems to be taking care of rear delts and traps quite well.