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On a recent visit to the States, I purchased a book on Jelly rolls and a roll of 2 1/2" strips of batik fabrics for making a jelly roll quilt. The book I bought is called Jelly Roll Quilts by Pam and Nicky Lintott.
My first jelly roll quilt is pictured here.
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The essential block (close-up) is made up of strips sewn together,
cut into large squares, cut in half,
and then the triangles are put together into these large 12" blocks.
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This is a surprisingly easy way to make use of all those
2 1/2" strips that you have in your stash!