Watch the Chicken Sixths online guitar lesson by Jeff McErlain from 50 Eclectic Blues Licks You MUST Know
I love the sound of 6ths. They are such a useful interval because they can be seen as inverted 3rds. So they sit comfortably on a chord and they are nice and open sounding.
In this lick I am playing diatonic 6ths in the key of G mixolydian, so start with that. Next try the same idea on the IV and V chords using C mixolydian and D mixolydian respectively. Then you are really cooking with gas!