This is a fun twist on a guest book, and will leave the graduate with plenty of well wishes and encouraging words to send them into their next adventure. I found this large mason jar at Target, and simply tied a piece of this twine and printed & attached this good luck label with scotch tape. So simple!
Then I printed several copies of these well-wishes notes and cut the paper in thirds. I also pre-cut several pieces of string to keep the process easy for guests. This good luck jar was a great activity to have in the entry way so people could leave well wishes as they came or left.

