Watch the Bluesy Double Stops online guitar lesson by Jennifer Batten from Rock Sauce For Lead Guitar
Try adding more double stops than you're used to in your soloing. Don't be afraid of using very abrasive combinations of notes. You can always resolve them or just use them for a split second for a dramatic effect. In the second phrase, I used a trick where I played out of a minor pentatonic fingering, and then moved the exact same fingering down a minor third. The harmony is C sharp 7 (dominant). The C sharp minor pentatonic gives it a minor sound while the A sharp minor pentatonic gives a major sound (against the C sharp root). Try playing pentatonic scales and patterns with this concept of switching back and forth between a minor sound and major sound.