Boring old jam jars.
Now cosy warm.
Not anything new- I've done the same sort of thing with tin cans before, and many other fabulous peeps have done similar.
But I just like it. It warms my cockles most merrily.
And I am craving autumnal warmth right now: 13 tog duvets, sheepskin boots, pub fires and chunky yarn made into anything on a 10mm hook.
Some simple back loop single crochet does it.
Really. It's that easy.