I have been collecting oatmeal, hot chocolate, Pringles and whey powder containers all summer. I added them to the block area this week and the kids love them! They can build castles and taller towers! All I did was leave the lids on and put some light blue contact paper around the outside. My students really enjoy building towers that are taller than they are! ( I even saw them take out the measuring tape and "measure" their towers). I really enjoy that they make so little noise when the towers fall.