This originates from Teletext, where 10th March looked like MAR10. Image source: https://www.superpage58.com/digitiser-vault-teletext-screenshot-image-archive-1993-01-01.htm

Source: https://flowerfairies.com/the-christmas-tree-fairy/

Source: https://flowerfairies.com/the-poppy-fairy/

Source: https://www.artstation.com/artwork/XBkR4D

Source: https://www.artstation.com/artwork/8Ygom

Source: https://amybrownart.com/collections/fall-and-halloween/products/8x10-fall-print-old-friends