Here is a cool and simple exercise using arpeggios for every chord in a key. In this example we will play in the key is G using all 7 diatonic chords. G Major, A Minor, B minor, C major, D7, E minor, F#-7 b5. Use your imagination you can get tons of uses out of these.
G A- B- C D7 E- F#-7b5
E |----3----5----7----8----10---12---14---
B |---------------------------------------
G |----4----5----7----9----11---12---14---
D |---------------------------------------
A |----5----7----9---10----12---14---15---
E |----3----5----7----8----10---12---14---
Tip: An Arpeggio is a chord played one note at a time.