100th Day paper chain- I actually remember doing this in kindergarten. Pinterest sure does bring back memories...
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CURIOUS GEORGE | George Counts to 100 for the 100 day of school
Just Reed: 100th Day Hoopla!
100th Day Hat FREEBIE! :)
Mrs. Jones' Creation Station: 100th Day of School Freebie
Fluttering Through First Grade: 100th Day of School
Ideas and activities for the 100th Day of School! Grab this cookie tag for free!
100th day of school kindergarten | 100th Day of School Gross Motor Preschool Lesson Plan
Would be cute just for a "fall" hallway display - have the kiddos paint the trunk of the tree, then trace hands with colored paper or have them make the leaves with handprints in colored paint.