Chromatic Harmony
Chromatic harmony is a compositional technique interspersing the primary diatonic scales and diatonic chords with the chromatic scale.
One cool thing that i just learned is if you play a C chord with you right hand and then with your left hand starting on the C note a octave or 2 down play Chromatic it sounds cool and is a great way to get ideas.
A Chromatic Harmony Playing Idea.
Here is a way to be chromatic with slides.