I use three jelly rolls and get a nice large quilt, about 65ish x85ish without the borders. I use whatever the strips I have.

Sew your strips together and keep sewing the lengths checking after 5-6 folds to seeif you have the length yiou want. I made one and after I had the length I wanted it was not wide enough so I sewed more strips together and then sewed them on the sides. Acutally I had to buy extra fabric. I use borders to make my quilts the width/length that I want. Inside of quilt can be smaller and border wider to bring quilt up to size you want.

You will *always* have the same strips next to each other in the 1600 jelly roll quilts. You fold a strip in half and sew it to itself. No way around that.

I think these quilts are the perfect canvas for applique!! I saw one done with a watery looking batik jelly roll with lily pads and a frog

I added giant orange poppies to mine. I just looked and I don't have a good pic of it finished.

Ooohhh. love the orange applique!

As to all this figuring - kinda sucks the joy out of a true jelly roll race! The fun is sewing strips together with abandon and see what you get. And then figuring out what to do with what you got.

Your Poppy quilt is beautiful. I have been watching for jelly rolls that I love to make a JRR quilt, but your applique shows w hole new range of possibilities.

I have done a couple of these jellyroll quilts. The first one I left the 40 strips whole except for cutting off 18 inches on the first strip. On that one I wasn't real happy with the "stacking". On the second one, I cut 20 of the strips in half, and the other 20 strips I cut into approximate one third length strips (13"). I then put them all in the dryer on air only to mix them up. This made for a better look that was much scrappier. I posted pictures of both on the thread I started which is called jellyroll 1600 if you would like to take a look.
Here is a link to those pictures. http://www.quiltingboard.com/main-f1...s-t199536.html

http://exuberantcolor.blogspot.com/2...ank-quilt.html

She gives ideas for making it longer and etc. or even different widths.

Jelly Roll Race 1600 experts? I need your help
 

I did a 'planned' faux 1600 scrap quilt (aka 1600 jelly roll quilt). I layed out my scraps in a sort of rainbow effect. The quilt was a challenge for 2011 for a longarm guild where I'm a member. (hope photo posting works)