This would be a cute craft project for kinders: Oceans in a bottle!
When I am 100 Years Old!
"when I'm 100 years old"... love this idea for 100 days of school!
100th Day of School!
Free 100th Day class book for primary grades. Things We've Been Told 100 Times! This post also includes some fun ideas for 100th day writing activities.
Mrs. Bohaty's Kindergarten Kingdom: 100th DAY!!!