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Crochet leaf/heart 3D lace flat cord. This tutorial takes a while to get into the actual tutorial, but it does show clearly how to make these very pretty leaves. Yarn: 55% Cotton, 45% Polyacrylic, 160m in 50g ( or 330m in 50g), 5 ply and crochet hook Crochet Hook size 2mm or 2.25mm (4 or 2 US standards). Tutorial 198

While this shows a specific pattern, it also shows the general technique. The most important tip here is that this uses "bullion wire" aka "French wire" which is a coiled extremely fine wire used in embroidery, which makes it very flexible and thus useful for this technique.

Crochet ripple cuff bracelet. To make the ends of the bracelet http://youtu.be/8B-N6x4u5t8

Pattern by Esther Chandler. A flattish crocheted cord, to which one can optionally add beads; good for jewellery.

A fun idea, to make crocheted 'daisies' for making daisy chains

Tutorial for a bracelet, crocheting with beads such that all the beads end up on the same side whether one is working on the front side or the back side. Useful technique which could be used for all sorts of things.

Turkish Beaded Crochet Video Tutorial