I've been spending some time on the five black keys, which form a simple and easy to remember Pentatonic scale (wiki). Five-note scales are popular in Asia and in Native American music. I recently performed Black Hills on a Roland keyboard (link) at Songmakers (link2). My friend Vic is brushing the drums.
Some say that pentatonic gives the music a primal, primitive feel. I find my time exploring the five black keys to be a freeing experience. Black Hills has a jazzy feel to it.