Our teacher is leaving after four years.  We were her first class in 2009.  I had each class bring in mementos for stepping stones for the teacher's garden.  I used 'cement all' from Home Depot ($18.00 per bag).  Next time I won't use plastic wrap to line the pizza boxes.  Just let the slop run out, I guess.  The top of each stone had to be power washed to get the mementos exposed.  I used a set of letter stamps from Harbor Freight Tools to mark washers with '2nd grade' and '2009-2010'.  A step for each year.  Now she'll be home with her almost 16 month old and a new one due in December.  She'll be busy!