A ready-made fundraising program where children sell Majblommor and both the seller and their group receive a share of the sales. The flower itself has been sold by Swedish schoolchildren for over a century, funding local support for children growing up in vulnerable circumstances.
One of the better reward setups on this site for younger children specifically: both the seller and their class or team keep a share, which makes it an easy first fundraising experience to explain to kids. Over a century of Swedish schoolchildren selling the same flower also means most parents and grandparents already know exactly what it is.