Watch the Dominant Soloing 1: 11 online guitar lesson by Brad Carlton from Bluesology 1

Let's add a flat 3 to the IV7 arpeggio (F-Aflat-A-C-Eflat) and the V7 arpeggio (G-Bflat-B-D-F) to introduce a chromatic approach tone to the major third. Applying this technique to your arps will create some tension in your solos.
Listen carefully while playing over the looped jam tracks so that you can differentiate the sound of the blues scale, dominant 7th arps, and the chromaticism introduced with the flat 3.