here is a tute I did on this. I use the small scraps that I are too small to save... usually 1/2 strips that I fold in half... I use them until they get to hairy with threads or to thick to easily sew over.
Check out the part of the tute, where I show how to use blocks instead of scraps too :wink: You can use any size blocks for this, I just showed the smaller ones I was currently working with, I have used 6" ones also :D:D:D
http://www.quiltingboard.com/t-38684-1.htm