As promised here is a clip of ideas played around an Am7 vamp.The pentatonics used are Am,Bm and Em. The major scales used are G major and C major. I have also thrown in the sound of the F#m7b5 arpeggio and the A melodic minor which includes the major 7th and is just a fun sound in this case.I have played slowly against my grain lol and played to a rhythm,a loop which you can extract to the end of the video. Cheers and hope it makes some sense.
http://www.youtube.com/watch?v=R8h1Ilnzmjw&feature=player_embedded