I think most of them are using the fabulous tutorial by Jeni of In Color Order. She previously posted a tutorial for this great bag, and now has made a pattern available with several different sizes.
I've only finished one so far, but I love it SO MUCH. Probably an inappropriate amount!
My favorite color, one of my favorite fabric designers, and a well written pattern. It's the sewing trifecta!
So, here's the one I've finished:
And here's what I have prepped:
It was almost painful to cut in to some of my favorite fabrics. But ooh, the new, scrappy possibilities!