An important expressive technique on any instrument is the use of Accents. An accent marking tells you to play the note louder than other notes. There are two common types of accents which are shown in the following diagrams. The long accent is indicated by a horizontal wedge mark above or below the note. The short accent is indicated by a vertical wedge mark.
Here are some more examples which use accents. They are all turnaround progressions played in different positions on the piano.
This one contains a repeated note pattern which results in a built-in accented rhythm.
Experiment with this type of playing to create your own parts.