Scraps but I wouldn't make the outer rows less squares. I would just keep them all 3 or 4 deep with black sashing strips.
Scrappy Block Tutorial
Speedy Scrappy Improv Quilt Blocks- this looks like fun! More
scrap jar stars tutorial
Another example of Simple and Amazing. Sugar Pop and Change by Lisa A Chavez, via Flickr
Do you love the look of quilts made from many different fabrics? I do! If you're looking for free scrappy quilt patterns here are twenty...
Great tutorial. CLICK onto the site for this one to see all the patterns with this one technique. Quiltvilles Quips & Snips!!: Scrappy Mountain Majesties!
quilt block to try
Sticks & Stones
from the blue chair: My strings quilt is finished!