If You Give A Mouse A Cookie by Laura Numeroff. Story about what happens when you give a mouse a cookie and what he will want next. This story can help teach cause and effect, sequencing, or a circular ending.
Book Character Halloween Costume: If You Give a Mouse a Cookie. Have the cookie be the trick or treat bag. Or have a younger sibling be the cookie! DIY Halloween costumes DIY kids costumes (Halloween Costumes For Teachers)
Mouse Caught in a Mouse Trap - Halloween Costume Contest at Costume-Works.com