When I study other composers music i try to focus on how they produce and expand on their material. Once I have pointed out the certain aspects the music that makes their piece intresting and desireable, I then attempt to mimic their sound with my own twist. Allow yourself to apply one composers technique into your own bag of tricks. I am not saying take Beethoven's fate theme and put it in your piece. I am simply saying, be aware the ways he expands and allows the motif to grow, and apply it to your own pieces in your own way. Also, take a look at the cadences, chords, and chord vocings used in different pieces and the color they produce.
Mike