Watch the Chunky Rock online guitar lesson by Vicki Genfan from 30 Strumming Patterns You MUST Know
I'm using power chords here, G-D-A-C. It's got a great, energetic feel suited well to rock, pop or even folk if you play it with a lighter attack and feel. As always, try this strum at different tempos and see how it changes things. It's particularly interesting if you slow it way down - give it a go!