Scale tone chords are the most common extended chords that you will find in a particular key. The following chord progressions contain only scale tone extension chords commencing and ending on the root note of the scale. The following exercise contains all the scale tone extensions in the key of C. The right hand plays all the notes of the chord together (block chord), while the left hand plays the chord in arpeggio style.
Experiment with your own chord progressions using only scale tone chords and scale tone chord extensions in the key of C, e.g.: