Use a print program such as Kid Pix and have 100 children design a "quilt square".  Print them out and put them together to display a "100 Day Quilt".
	Use the Internet to learn how to count to 100 in a different language.
	Research 100 special days or Festivals from around the world.
	Collect 100 useful, school appropriate web addresses.  These can be put in a book, on note cards, or added to Favorites.
	Create a web page with the children's activities showcased.  These could include pictures of students' "100 Collections", copies of their writing "If I had a $100...", List of 100 words that your students know .... you are limited here only by your imagination! This activity will enable them to share the day with their friends and family.
	Each child writes/draws about their favorite activity of the day in Kid Pix or other available program.  Make a slide show of all the pictures.
	Research how to say "hello" or "goodbye" in 100 different languages.
	Graph 100 items of your choice (m&m's, colors children are wearing, etc).  Graph the information using Excel or graphing program of your choice.
	If your 100th day falls in February, use the Internet to research 100 African Americans.
	Make a timeline of the last 100 years.  Include important events.  This can be done using TimeLiner (Tom Snyder).
	Start an online project.  Here are some ideas: 1. Collect 100 emails from 100 different people in 100 different places. 2.  Collect 100 jokes. 3. Collect 100 postcards.  Again, this one is adaptable to you.

Disclaimer: Some of these projects are my own, I've seen others do some of  them, or read about them somewhere. I travel a lot and surf the Internet all the time so I can't give credit where credit may be due.