DIY Mason Jar Candles, a lovely tutorial by fineandfeathered. Full tutorial can be found here.
DIY mason jar flower pot lids:
http://www.craftaholicsanonymous.net/how-to-make-mason-jar-flower-frog-lids-tutorial
Crocheted mason jar covers - this isn’t a free pattern, but it is lovely! Available in Fidgety Hands etsy shop:
Mason jar bathroom storage idea:
http://lovelylittledetails.com/2011/03/13/mason-jar-sunday-diy-mason-storage-from-liz-marie-3/
Crochet pattern for this jam jar bonnet, cute! Would make a lovely addition if you were giving any jar-related gifts this Christmas!
http://maizehutton.blogspot.com/2011/09/jam-jar-bonnet-pattern.html
Halloween lanterns DIY:
Hanging lantern DIY:
http://www.make-it-do.com/make-it/wedding-mason-jar-lanterns/
Another mason jar DIY - because the possibilities are endless!
http://www.kristanlynn.com/2011/07/diy-fancy-tops-pretty-up-your-craft.html
You know when you light candles and the wick burns leaving loads of surrounding wax unmelted? This tutorial is a great way to use up that wax, as well as a way to recycle mason jars.
http://justcallmechris.blogspot.com/2011/03/recycled-candle-diy.html