If so, please don't make the mistake I did.
I knew I needed 20 blocks so I chose 10 fabrics and did a "lefty" stem and "righty" stem from each color. I didn’t think it through: three rows of 4 blocks is twelve and two rows of 4 blocks is eight. I made 10 of each which doesn't work.
As you can see, when I put them on my design wall I am missing two "lefty" stems (and, yes, I have two "righty" stemmed flowers that will not be used).
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I hope this post saves someone from having to make more blocks when they thought they were done!