I must confess I have a yarn stash left over from my knitting days. So if you have one of those, here are some jewelry tutorials to get you going on whittling down that stash!

Even the yarn companies are getting into the act.  The Mademoiselle crochet necklace tutorial by Berroco uses embroidery accents, crochet chains and and a très jolie bow closure. It's just lovely. Thanks Willi for this tip!

Alison M. of Ornamentea posted the Wish For You Necklace tutorial on Cut Out and Keep.  Her tutorial makes use of multiple strands of silk.  I agree with her that this design is suitable for people with metal allergies as the silk strands are the only parts in contact with the skin.

Alison also has the silken strand bracelet tutorial which was posted on Ornamentea as well as on Cut Out and Keep.

Aromy's wonderful knotty knitted necklace tutorial is another design ideal for metal allergic wearers. Her basic necklace uses basic crochet and knitting techniques to form an i-cord and fastener. Then she has some great suggestions to customize it. Shown here is the finished necklace made into one half of a good luck Chinese knot.

This awesome looped fringe crochet choker is by the Double Stitch Twins.

This crochet bangle tutorial by Phyllis Serbes strikes me as a candidate for wire crochet too.
I crochet with wire but haven't really explored the yarn variety. The really pretty  crochet flower earrings tutorial by Un Jardin De Hilo has inspired me to give it a whirl.

Linda P's crochet star earrings tutorial on Cut Out and Keep is another "stellar" design!

Maggie Petsch's gorgeous crochet marigold pin tutorial can also be adapted for hair grips, hair bands and perhaps even as necklace focals.

Never ever throw away scraps. You can make Tina Hilton's yarn remnant necklace design as shown on Craftstylish. She adds it's a great alternative to a scarf on colder days.

Margaret Hagan over at Razblint has a super easy scrap yarn necklace tutorial.

Aniko over at the Art is Tree blog has a lovely yarn wrapped necklace tutorial which really brings out her silver pendant. She wraps the yarn around a plastic tube. What's really clever is the use of magnetic clasps at the tube ends.Via 

Hat tip to Dana for finding this wonderful necklace tutorial by Honestly...WTF. It's colorful - wear multiple versions or use it as a cord for a focal.

Other yarn tutorials to try:
Original Post by THE BEADING GEM
Jewelry Making Tips - Jewelry Business Tips