I'm trying to write a break riff with a downward movement. I want it to be mystical sounding (messing around w/ the Phrygian...) but it always comes out cheesy. Anyways, I need it to imply the following progression:

G - Am - Cmaj7 - Fmaj7

in the key of C. Any ideas?
could you maybe record what you got so far so we can here your beat and stuff might help
**** You