Jar Doilies Crochet Patterns 6 Thread Crochet by PaperButtercup, $12.00
How to Crochet: Mason Jar Cozy (I'm such an octogenarian!)
Crochet--Holiday lamps????? Not sure what to use these for, but they are cute!
Crochet Jar Cover #2 - free pattern in English or Icelandic by Ólöf Lilja Eyþórsdóttir / Föndrari af lífi og sál
Cute jar lanterns which can be crocheted with string or yarn.
Mason Jar Cozy | Free Crochet Pattern by Little Monkeys Crochet (lwww.littlemonkeyscrochet.com)
Crochet jar cover - free pattern (probably have to starch the piece after putting it on the jar to keep the shape)
Crochet Pineapple Heart Doily: free pattern