I made them. Or more accurately, I shrunk some.
I traded the velvet flowers for some similar-sized fabric ones that were laying around loose in the decoration boxes. There were the regular red ones, a darker red, and some pink ones. I pulled the flowers apart, and proceeded to cut the petal sections down to about half. I also cut off some of the outer stamens to reduce the size of the centers. Then I put the flowers back together again.
Voila! Tiny poinsettia plants!