You can find complete board games that can be customized and printed out or even very simple word scrambles, word finds and word searches. The last three are probably the most commonly found printable games and can usually be found on the web for free.
Halloween printables idea is Keepsakes. Kids they can use these special pages to make a scrapbook of their memories of trick_or_treat. Once the kids add photos of their spooky adventures, the book will serve a nice keepsake for years to come.