We will show here a tool to increase even more your solo, it is the Octave Displacement (or octave dispersion).
The idea is really simple: to have fun with octaves. The interesting is that even working only with tonal notes (without outside notes), it is possible to have a differentiate sonority! This study will help you to make a solo in a way less linear and more “easy-going”.
Learn more here: http://www.simplifyingtheory.com/octave-displacement/