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This is the same technique that we used in making rag rugs. These are my own figures so use what you like.
l. Determine the width of quilt you want minus the borders. Have at least three coordinating colors, light, med and dark always work.
2. Take the number from the width and then take 34 %, 55 % and 83% of that number. Cut your strips in those lengths.
for example lets say you want a 60 inch wide (without the borders) (and ignore the seam allowance and the part that you lose when sewing it together). So 60 times .34 is 20.4. ......and 60 times .55 is 33 .....and 60 times 49.8.
And I would cut my strips in 20 1/2, and then 33 and then 50 inch lengths.
You need some 20 1/2 in each of the colors so you would end up with 9 piles of strips. Lay them in stacks around a table and go along and pick one from each stack and make your pile to sew. Arrange the strips so that the next pile is not the same color or size.
This gives a total random look.
It sounds very similar to staggered bricks. I am making one now for my 12 yr old DGD for Christmas--she picked out the jelly rolls--ugly ugly 70's style material, flowers power, piece signs, bright and bold. It's twin size ans took 2 jelly rolls and a few strips I had to cut from my stash. Has anyone else noticed how much material is beginning to look like the hippie days? Not sure how I enjoyed them so much then but don't now--older, maybe? LOL
I saw a chart somewhere that gave the sizes of the jelly roll quilts according to the number of strips you use: 40 strips make a 48x68 quilt, 55 strips = 55x84, 69 strips = 70x83, 82 strips = 78x88, 96 strips = 88x92 inch quilt.
Jenny on Missouri Quilt Company does a video on this as well. I have made several and they are so easy and so different.
Yes, jelly roll, it is a fast put together. I did mine with 2 jelly rolls so that made it a 60 inch square. A friend of mine likes it so I am planning on giving it to her instead of using it myself.
I made one in fall colors (using batik 2 1/2" strips that I cut) and now I am in the process of appliquing leaves scattered around the quilt as if blown by the wind. Starting to look pretty good.