Watch the Funky Octave online guitar lesson by Vicki Genfan from 30 Strumming Patterns You MUST Know
I'm using octaves here (A's) - with a straight eighth note strum. The real trick of this strum is the left hand muting. Take the time to work on getting this down! Once you've done that you can add the 16th note chicken scratches in between the 8th notes.
I've played only a single note (two notes actually - the octave). Try moving around with your octaves and picking out a line or melody.