The following images have been used in the Pens and patterns sequence:
| Image | Attribution |
| Agricultural Show | iStock/Scott O'Neill |
| Cute lamb, Isle of Skye | iStock.com/dapec |
| Smart farmer with notes for checking quality in hands on organic farm pig | iStock.com/tuaindeed |
| Grunge red proven word rubber seal stamp on white background | iStock.com/bankrx |
| Sheep Winning 1st Prize at Village Fair | iStock.com/DominicLemoinePhotography |
| Symbol. equal. equal. same. Written on a wooden block | iStock/35mmf2 |