Double Stops

There is a pattern for the double stops that may fit well
over a chord.  This is for a G Chord or it's variations. 
As you can see the double stop for the G9 is made up of 
the 7th and 9th so it defines the G9, and the G7 is made of
of the 5th and 7th.  And the G is a comibination of the 1st
3rd and 5th depending on which one double stop you use.
Home base for these licks is the F Formation of the chord.
The F Formation of the G chord is xx5433 so there you go.
You can see where the F formation G Chord overlaps the 
double note lick.

If you want to use this same thinking on other chords you 
can find the chords F formation and start the pattern again


 G9   G   G  G  G7

E-1---3---5--7--10-----------------------------------------|
B----------------------------------------------------------|
G-2---4---5--7--10-----------------------------------------|
D----------------------------------------------------------|
A----------------------------------------------------------|
E----------------------------------------------------------|

This is just a cool lick over an A chord using some 
variations and slides.

  A
E-5--7--8/9---/9--9--8--7--5-----9---9------7---7-------5--|
B----------------------------------------------------------|
G-6--7--8/9---/9--9--8--7--6--/9---9--9-8/7---7---7-5/6----|
D----------------------------------------------------------|
A----------------------------------------------------------|
E----------------------------------------------------------|

There's much more to go over in doublestops in country but
this is a pretty good start I believe.