Over Gm7, many jazz players would play the Am7 arpeggio.

The Gminor Dorian Scale:

G A Bb C D E F

The Aminor7 Arpeggio:

A C E G

It accentuates a few of the notes that make the G dorian sound jazzy, such as the 4th, 6th and 7th. Try it out.

Over C7 Try playing the Eminor7b5 arpeggio:

E G Bb D

it contains the 3rd, 5th, 7th, and 9th of C7