This picture well portrays the thoughts of what the person in the picture is thinking of. This goes along with our theme because it brings up the word "memory". I think "leaving our mark" means reminding one with the memories we had at school.
Simple DIY! The dollar store oftentimes has gorgeous flowers, thrift stores always have vintage frames, and for those who want something a little sturdier than cardboard for the letter, Michaels or JoAnn's carry wooden letters in all sizes!