Hang the sight word of the week on the door and students "high five" the word and say it as they leave the room. I've also seen teachers put a vocabulary word of the week on the door! Kids see it coming and going!
First week of school time capsule- stamp & date their itty hand prints, measure their height with yarn, and have them fill out a little first day info sheet with their self portrait on the back. Then save until the day of their high school graduation.
Brain Builders Club - bulletin board with task cards for early finishers. Students choose a set of cards to study. Then they take a test and if correct, they earn a Brain Bead. What an awesome idea! Especially for the kids who need extra challenge!