The word jar is a handy tool to have in your writing space. It is exactly what it sounds like, a jar full of words! Simply write out as many random words as you wish on scraps of paper, fold them up and put them into the jar. It works best if you keep the words as varied and un-related as possible. You will find there are many writing warm ups and activities that this random word jar will come in handy for.
In particular you can use your random word jar for a directed free writing warm up. All you have to do is pull out a word from your random word jar and free-write about that word for a set length of time. This direct approach works well if you find the idea of undirected free writing, or trying to pick your own topic from thin air intimidating.
Your jar can be as plain or as prettied up as you would like. Keep it close to where you do most of your writing, so whenever you need a little writing warm up, some inspiration, or an excuse to procrastinate you can grab your jar, pull out a word and stretch those creative muscles.