In my recent page 15 and 16 of my "International Greetings" mini album, I've tried to create a chewed away edges effect for some of my pattern papers and card stocks.
These are what I had ended up with.
I've used a hand held daisy puncher and randomly punched around the edges of the pattern papers and card stocks. Later, I've inked all the edges with some distress ink. I've also used that technique to create a mask to masked on some areas in page 16.
I've had so much fun with this technique and I think it really gives a cool looked to those pages. Try it in your next layout!