Why not go to the source- Indian music.Unusual time signatures and beats abound. It can be a challenge to keep up with the sophisticated,complex and detailed formulas that make up most Raga's. Twentieth century classical composers also used some amazing alternating time signatures. Add Dave Brubeck with "Take Five" plus dozens of other of his like minded compositions-it became his "thing" .Gil Evans work with Miles "Sketches of Spain", and he went on to incorporate that into his own writing .Listen to "East West" by the Paul Butterfield Blues Band which feeds off of the basic 4/4 and then switches to a take 5/Raga rock mondo Bolero for an extended improvisation with soaring guitar from Mike Bloomfield. This was really the first long,extended "jam" that fostered much of what you would hear in the next few years from San Francisco groups,I.E. "the dead". Also the Charles LLoyd Quartet "forest Flower" and "Sombrero Sam"-live at the Monterey Jazz Festival.The odd time signature is an ever expanding musical universe with lots of galaxies!