Here is a picture of a block I threw together with these little practice flowers. It is flawed in that I used a cheap weight fabric and wasn't careful...
I saw this on a Simply Quilts episode featuring author Rebecca Wat, who's written a book about adapting origami techniques for fabric and then using them in quilt making. Here is the fold/block she showed us. I think she called it an "inside out flower".
Step 1: Start with a square
Here is a 6" square. Be precise in your measuring whatever size you choose. Just make sure it is square.