If you have access to the Oxford English Dictionary, whether in giant print or online database (check with your library), choose a word to look up. Spend time reading aloud every one of its senses and earliest instances in print. Then write ten sentences delighting in that word’s older and weirder senses or spellings. Let your word sit in the sentence the way a gem sits in a ring.
(The OED is going to have much more volume of early instances than anywhere else, but if you don’t have OED access, use an etymological dictionary or read the etymology of a word on Merriam-Webster’s site or similar.)