When Thinking Day was first introduced, in 1932, the suggestion was to give 'a penny with your thoughts' to help Guiding grow. From around the world, members gave a penny, or it's equivalent, to the Thinking Day fund. In some places, a tradition developed of polishing the coins, to make an extra special gift. Ever since then, each member has been encouraged to donate to the fund, which is administered by the World Association of Girl Guides and Girl Scouts (WAGGGS).
Guides from 104 countries have donated to the fund in the past fifteen years; in 2016, 117,000 pounds was donated. In 2017 115 countries used the WAGGGS Thinking Day activity pack for that year (which was translated into 14 languages), 6110 members planted trees, and more than 70% of the participants invited a friend to join Guiding.