How to Crochet 3D Flower for beginners – video tutorial. Free Shell Flower Stitch Pattern. For crochet beginner's, it will introduce the weave of simple basic: a chain ring, single crochet, half-double crochet, double crochet, slip and shell stitches. This beautiful 3D flower works up quick and easy. Shell stitch. Two, three, or more stitches may be worked into the same place to make a fan of stitches, often also called a shell.