Let's say you're playing a duo or trio without a pianist, playing on some jazz tunes with which you're familiar, and you want to beef up your walking line to fill out the sound. Large intervals like tenths and sevenths will help you outline the chords.

The danger here is that double-stops played too far down the neck can sound muddy, and it takes extra care to stay swinging when working your way across the strings to play the wide intervals. The trick is to avoid playing below fifth position while making sure your right hand smoothly moves across the strings while alternating between index and middle fingers.

Here is an example of a line that goes around the cycle of fourths, alternating major tenths played on the E and G strings with minor sevenths on the A and G strings.

I suggest you play the major tenths using the left hand fingering 1-4, and the sevenths 1-3