100th Day Library Center

Next Tuesday we'll have our 100th day of school. If you walk into a kindergarten classroom at our school, you'll know it right away. They've been counting the days since day one (for math purposes, of course!).
Here's a great 100th day center for the library, although I think I'll leave it out all week, not just for the 100th day. This came from Doodle Bugs Teaching, a first grade teacher (who also designs super cute personalized stationery).

Now, how simple would this be to set up? Write the prompt at the top of a poster board, or piece of chart paper (responses will be lined and neat) or butcher paper (responses will be random and all over the place). Put a bin of markers at the table, and let your students write (and illustrate) their thoughts.
Display the finished posters on the wall for others to read! I am curious to see what our students will write at this library center.
Do you do anything special in YOUR library for the 100th day of school?