I did one with 2-1/2" strips. I don't remember the qty of strips I used...worked from a combination of my stash and assorted jelly roll strips I had on hand. I love it, but you do need to consider what layout you want vs. the size of the blocks. I wanted a barn raising pattern and had to use an even number of rows/columns to get the look I wanted. My quilt is huge - 96" square or so.

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